Fix php cheatsheet, for loop

iterates over all values, not just n-1 values

languages/php.php

@@ -24,7 +24,7 @@ foreach($arr as $key => $value) {
 }
 
 // For
-for($i = 0; $i < count($arr) - 1; $i++) {
+for($i = 0; $i < count($arr); $i++) {
     $key = $i;
     $value = $arr[$i];
 }
@@ -338,4 +338,4 @@ class ClassWithLogger
      * Use the LoggerAwareTrait in this class.
      */
     use LoggerAwareTrait;
-}
+}