mirror of
https://github.com/namibia/awesome-cheatsheets.git
synced 2024-11-08 14:21:05 +00:00
561 lines
14 KiB
PHP
561 lines
14 KiB
PHP
<?php
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// Exit the file, string inside get's echo'ed
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die("This file is not ment to be ran. ¯\_(ツ)_/¯");
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exit("This file is not ment to be ran. ¯\_(ツ)_/¯");
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/**
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* Printing
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*/
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echo ""; // Print a string or type that can be made into a string(I.E int, float).
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print_r($arr); // Print anything, with type hints for array's and object's
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var_dump($arr); // Print anything, with type hints for any value and sizes
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/**
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* Usefull string manipulation methods
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*/
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$string = 'Awesome cheatsheets';
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str_contains($string, 'cheat'); // Find if the string contains the specified string (PHP >= 8.0)
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str_replace('Awesome', 'Bonjour', $string); // Replace all occurence (PHP >= 8.0)
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strcmp($string, 'Awesome cheatsheets'); // Compare two strings
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strpos($string, 'a', 0); // Get position in the string
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str_split($string, 2); // Split the string
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strrev($string); // Reverse a string
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trim($string); // Strip whitespace from the beginning and end of a string
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ucfirst($string); // Make a string's first character uppercase
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lcfirst($string); // Make a string's first character lowercase
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substr($string, 0, 4); // Return part of a string
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/**
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* Declaring an Array
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*/
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// Indexed Array
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$arr = array("John", "Doe", "Lorem", "Ipsum");
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// Associative Array
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$arr = array("John"=>"10", "Doe"=>"200", "Doe"=>"3000", "Ipsum"=>"40000");
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// Multidimensional Arrays
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$arr = array (
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array("John",100,180),
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array("Doe",150,130),
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array("Lorem",500,200),
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array("Ipsum",170,150)
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);
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// Declaring array with short syntax
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$arr = ["John", "Doe", "Lorem", "Ipsum"]; // Indexed Array
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$arr = ["John"=>"10", "Doe"=>"200", "Doe"=>"3000", "Ipsum"=>"40000"]; // Associative Array
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$arr = [
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["John",100,180],
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["Doe",150,130],
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["Lorem",500,200],
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["Ipsum",170,150], // You can have a "," at the end without throwing syntax errors
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];
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/**
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* Sorting an Array
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*/
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sort($arr); // Sort arrays in ascending order.
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rsort($arr); // Sort arrays in descending order.
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asort($arr); // Sort associative arrays in ascending order, according to the value.
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ksort($arr); // Sort associative arrays in ascending order, according to the key.
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arsort($arr); // Sort associative arrays in descending order, according to the value.
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krsort($arr); // Sort associative arrays in descending order, according to the key.
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/**
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* Ways of looping
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*/
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continue; // Skip current iter
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break; // Exit loop
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// Foreach
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foreach($arr as $key => $value) {
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$key = $key;
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$value = $value;
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}
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// For
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for($i = 0; $i < count($arr); $i++) {
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$key = $i;
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$value = $arr[$i];
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}
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// While
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$i = 0;
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while($i < count($arr) - 1) {
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$key = $i;
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$value = $arr[$i];
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}
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// Do while
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$i = 0;
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do {
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$key = $i;
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$value = $arr[$i];
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} while($i < count($arr));
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// Switch
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switch($arr) {
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case 1:
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break;
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case 2:
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break;
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case 3:
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break;
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default:
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}
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/**
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* Match (PHP >= 8.0)
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* https://www.php.net/manual/fr/control-structures.match.php
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*/
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$food = 'apple';
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$return_value = match($food) {
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'apple', 'appel' => 'An apple',
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'banana' => 'A banana',
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'applepie' => 'An applepie',
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default => 'A fruit'
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};
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//You can also use it as a conditionnal and throw exceptions
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$str = 'Welcome to awesome cheatsheets';
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$return_value = match(true) {
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str_contains($str, 'Welcome') && str_contains($str ,'to') => 'en-EN',
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str_contains($str, 'Bonjour') && str_contains($str, 'sur') => 'fr-FR',
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default => throw new Exception('Not a recognized language')
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};
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/**
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* Global variables
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* http://php.net/manual/en/language.variables.superglobals.php
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*/
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$_SERVER; // SERVER variables
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$_GET; // Query params
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$_POST; // Post fields
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$_REQUEST; // GET and POST together
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$GLOBALS; // Array of global variables
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$_SESSION; // Browser session
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$_FILES; // Array of files that are sent in request
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$_COOKIE; // Array of cookies sent in request
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$_ENV; // php.ini options
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$argv; // Array of terminal arguments (filename included)
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$argc; // Number of arguments passed into terminal
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/**
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* Class
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* http://php.net/manual/en/language.oop5.basic.php
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*/
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class NormalClass extends AbstractClassName implements InterfaceName
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{
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use TraitName;
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// --> PROPERTY TYPES <--
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/**
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* Public property, everyone can access this property.
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* @var Type
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*/
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public $property;
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/**
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* Private property, only this instance can access this property.
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* @var Type
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*/
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private $property;
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/**
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* Protected property, this instance and childs can access this property.
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* @var Type
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*/
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protected $property;
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/**
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* Static property, is the same for all instances of this class.
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* @var Type
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*/
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static $property;
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// --> FUNCTION TYPES <--
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/**
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* Public function, everyone can access this function.
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* @param Type
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* @return Type
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*/
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public function publicFunction(Type $var = null): Type
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{
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}
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/**
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* Private function, only this instance can access this function.
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* @param Type
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* @return Type
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*/
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private function privateFunction(Type $var = null): Type
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{
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}
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/**
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* Protected function, this instance and childs can access this function.
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* @param Type
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* @return Type
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*/
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protected function protectedFunction(Type $var = null): Type
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{
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}
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/**
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* Static function, doesn't need an instance to be executed.
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* @param Type
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* @return Type
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*/
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public static function staticFunction(Type $var = null): Type
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{
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}
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// --> MAGIC METHODS <--
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/**
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* Gets triggered on creating a new class instance
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* http://php.net/manual/en/language.oop5.decon.php
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* @param Type
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* @return void
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*/
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public function __construct(Type $var = null)
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{
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}
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/**
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* Gets triggered on destruction of a class instance
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* http://php.net/manual/en/language.oop5.decon.php
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* @return void
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*/
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public function __destruct()
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{
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}
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/**
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* __set() is run when writing data to inaccessible properties.
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* http://php.net/manual/en/language.oop5.overloading.php
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* @param string name
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* @param mixed value
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* @return void
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*/
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public function __set(string $name , mixed $value)
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{
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}
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/**
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* __get() is utilized for reading data from inaccessible properties.
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* http://php.net/manual/en/language.oop5.overloading.php
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* @param string name
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* @return mixed
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*/
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public function __get(string $name)
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{
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}
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/**
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* __isset() is triggered by calling isset() or empty() on inaccessible properties.
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* http://php.net/manual/en/language.oop5.overloading.php
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* @param string name
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* @return bool
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*/
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public function __isset(string $name)
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{
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}
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/**
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* __unset() is invoked when unset() is used on inaccessible properties.
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* http://php.net/manual/en/language.oop5.overloading.php
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* @param string name
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* @return void
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*/
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public function __unset(string $name)
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{
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}
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/**
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* __call is triggered when invoking inaccessible methods in an object context.
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* http://php.net/manual/en/language.oop5.overloading.php
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* @param string name
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* @param array arguments
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* @return mixed
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*/
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public function __call(string $name, array $arguments)
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{
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}
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/**
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* __callStatic() is triggered when invoking inaccessible methods in a static context.
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* http://php.net/manual/en/language.oop5.overloading.php
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* @param string name
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* @param array arguments
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* @return mixed
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*/
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public static function __callStatic(string $name, array $arguments)
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{
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}
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/**
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* http://php.net/manual/en/language.oop5.magic.php
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* @return array
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*/
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public function __sleep()
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{
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}
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/**
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* http://php.net/manual/en/language.oop5.magic.php
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* @return void
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*/
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public function __wakeup()
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{
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}
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/**
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* http://php.net/manual/en/language.oop5.magic.php
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* @return string
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*/
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public function __toString()
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{
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}
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/**
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* http://php.net/manual/en/language.oop5.magic.php
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* @param Type
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* @return mixed
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*/
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public function __invoke(Type $var = null)
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{
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}
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/**
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* http://php.net/manual/en/language.oop5.magic.php
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* @param array properties
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* @return object
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*/
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public static function __set_state(array $properties)
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{
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}
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/**
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* http://php.net/manual/en/language.oop5.magic.php
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* @return array
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*/
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public function __debugInfo()
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{
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}
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}
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/**
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* Every class that has implemented this interface need to have the same functions.
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*/
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interface InterfaceName
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{
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public function FunctionName(Type $var = null): Type;
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}
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/**
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* Combination of class and interface.
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*/
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abstract class AbstractClassName
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{
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/**
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* Classes extending this abstract class need to have this function.
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* @param Type
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* @return Type
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*/
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abstract function abstractFunction(Type $var = null): Type;
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}
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/**
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* Basic Implementation of LoggerAwareInterface.
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* @see https://github.com/php-fig/log/blob/master/Psr/Log/LoggerAwareTrait.php
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*/
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trait LoggerAwareTrait
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{
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/**
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* The logger instance.
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*
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* @var LoggerInterface
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*/
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protected $logger;
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/**
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* Sets a logger.
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*
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* @param LoggerInterface $logger
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*/
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public function setLogger(LoggerInterface $logger)
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{
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$this->logger = $logger;
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}
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}
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/**
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* Example with use of LoggerAwareTrait.
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*/
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class ClassWithLogger
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{
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/**
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* Use the LoggerAwareTrait in this class.
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*/
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use LoggerAwareTrait;
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}
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/**
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* Enums (PHP >=8.1)
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* https://www.php.net/manual/fr/language.types.enumerations.php
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*/
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interface StateCode {
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public function stateCode() : int;
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}
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enum States implements StateCode {
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case Running;
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case Stopped;
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public function stateCode() : int {
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return match($this) {
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State::Running => '444',
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State::Stopped => '666'
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};
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}
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}
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/**
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* You can also declare backed Enums
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*/
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enum States : int implements StateCode {
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case Running = 1;
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case Stopped = 0;
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public function stateCode() : int {
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return match($this) {
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State::Running => '444',
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State::Stopped => '666'
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};
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}
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}
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/** Enums can be use as a type */
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function notify(State $state) {
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// ...
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}
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notify(State::Running);
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/**
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* PHP Regex.
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*/
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// Meta Characters.
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^ Start of subject (or line in multiline mode)
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$ End of subject (or line in multiline mode)
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[ Start character class definition
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] End character class definition
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| Alternates, eg (a|b) matches a or b
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( Start subpattern
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) End subpattern
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\ Escape character
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// Pattern Modifiers.
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i Caseless - ignore case
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m Multiline mode - ^ and $ match start and end of lines
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s Dotall - . class includes newline
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x Extended- comments & whitespace
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e preg_replace only - enables evaluation of replacement as PHP code
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S Extra analysis of pattern
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U Pattern is ungreedy
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u Pattern is treated as UTF-8
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// Subpattern Modifiers & Assertions.
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(?:) Non capturing subpattern ((?:foo|fu)bar) matches foobar or fubar without foo or fu appearing as a captured subpattern
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(?=) Positive look ahead assertion foo(?=bar) matches foo when followed by bar
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(?!) Negative look ahead assertion foo(?!bar) matches foo when not followed by bar
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(?<=) Positive look behind assertion (?<=foo)bar matches bar when preceded by foo
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(?<!) Negative look behind assertion (?<!foo)bar matches bar when not preceded by foo
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(?>) Once-only subpatterns (?>\d+)bar Performance enhancing when bar not present
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(?(x)) Conditional subpatterns (?(3)foo|fu)bar Matches foo if 3rd subpattern has matched, fu if not
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(?#) Comment (?# Pattern does x y or z)
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// Base Character Classes
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\w Any "word" character (a-z 0-9 _)
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\W Any non "word" character
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\s Whitespace (space, tab CRLF)
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\S Any non whitepsace character
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\d Digits (0-9)
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\D Any non digit character
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. (Period) - Any character except newline
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// Multiplicity.
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n* Zero or more of n
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n+ One or more of n
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n? Zero or one occurrences of n
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{n} n occurrences exactly
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{n,} At least n occurrences
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{,m} At most m occurrences
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{n,m} Between n and m occurrences (inclusive)
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// PHP Regular Expression Functions.
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Function Description
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preg_match() The preg_match() function searches string for pattern, returning true if pattern exists, and false otherwise.
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preg_match_all() The preg_match_all() function matches all occurrences of pattern in string. Useful for search and replace.
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preg_replace() The preg_replace() function operates just like ereg_replace(), except that regular expressions can be used in the pattern and replacement input parameters.
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preg_split() Preg Split (preg_split()) operates exactly like the split() function, except that regular expressions are accepted as input parameters.
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preg_grep() The preg_grep() function searches all elements of input_array, returning all elements matching the regex pattern within a string.
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preg_ quote() Quote regular expression characters
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// Code Snippets.
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//A better solution for validate email syntax is using filter_var.
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if (filter_var('test+email@fexample.com', FILTER_VALIDATE_EMAIL)) {
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echo "Your email is ok.";
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} else {
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echo "Wrong email address format.";
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}
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//Validate username, consist of alpha-numeric (a-z, A-Z, 0-9), underscores, and has minimum 5 character and maximum 20 character.
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//You could change the minimum character and maximum character to any number you like.
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$username = "user_name12";
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if (preg_match('/^[a-z\d_]{5,20}$/i', $username)) {
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echo "Your username is ok.";
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} else {
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echo "Wrong username format.";
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}
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//Validate domain
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$url = "http://domain-name.com/";
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if (preg_match('/^(http|https|ftp):\/\/([A-Z0-9][A-Z0-9_-]*(?:\.[A-Z0-9][A-Z0-9_-]*)+):?(\d+)?\/?/i', $url)) {
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echo "Your url is ok.";
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} else {
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echo "Wrong url.";
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}
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//Extract domain name from certain URL
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$url = "http://domain-name.com/index.html";
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preg_match('@^(?:http://)?([^/]+)@i', $url, $matches);
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$host = $matches[1];
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echo $host; // domain-name.com
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//Highlight a word in the content
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$text = "A regular expression (shortened as regex) is a sequence of characters that define a search pattern. Usually such patterns are used by string-searching algorithms for 'find' or 'find and replace' operations on strings, or for input validation.";
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$text = preg_replace("/\b(regex)\b/i", 'replaced content', $text);
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echo $text; /*A regular expression (shortened as replaced content) is a sequence of characters that define a search pattern. Usually such patterns are used by string-searching algorithms for 'find' or 'find and replace' operations on strings, or for input validation.*/
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