docker/4.4/php8.1/fpm/makedb.php

<?php
// Args: 0 => makedb.php, 1 => "$JOOMLA_DB_HOST", 2 => "$JOOMLA_DB_USER", 3 => "$JOOMLA_DB_PASSWORD", 4 => "$JOOMLA_DB_NAME", 5 => "$JOOMLA_DB_TYPE"
$stderr = fopen('php://stderr', 'w');
fwrite($stderr, "\nEnsuring Joomla database is present\n");

if (strpos($argv[1], ':') !== false)
{
	list($host, $port) = explode(':', $argv[1], 2);
}
else
{
	$host = $argv[1];
	$port = null;
}

$user = $argv[2];
$password = $argv[3];
$db = $argv[4];
$dbType = strtolower($argv[5]);

if ($dbType === 'mysqli')
{
	$port = $port ? (int)$port : 3306;
	$maxTries = 10;

	// set original default behaviour for PHP 8.1 and higher
	// see https://www.php.net/manual/en/mysqli-driver.report-mode.php
	mysqli_report(MYSQLI_REPORT_OFF);
	do {
		$mysql = new mysqli($host, $user, $password, '', $port);

		if ($mysql->connect_error)
		{
			fwrite($stderr, "\nMySQL Connection Error: ({$mysql->connect_errno}) {$mysql->connect_error}\n");
			--$maxTries;

			if ($maxTries <= 0)
			{
				exit(1);
			}

			sleep(3);
		}
	} while ($mysql->connect_error);

	if (!$mysql->query('CREATE DATABASE IF NOT EXISTS `' . $mysql->real_escape_string($db) . '`'))
	{
		fwrite($stderr, "\nMySQL 'CREATE DATABASE' Error: " . $mysql->error . "\n");
		$mysql->close();
		exit(1);
	}

	fwrite($stderr, "\nMySQL Database Created\n");

	$mysql->close();
}
elseif ($dbType === 'pgsql')
{
	$port = $port ? (int)$port : 5432;
	$maxTries = 10;

	do {
		$connection = "host={$host} port={$port} user={$user} password={$password}";
		$dbconn = @pg_connect($connection);

		if (!$dbconn)
		{
			fwrite($stderr, "\nPostgreSQL Connection Error\n");
			--$maxTries;

			if ($maxTries <= 0)
			{
				exit(1);
			}

			sleep(3);
		}
	} while (!$dbconn);

	$query = "SELECT 1 FROM pg_database WHERE datname = '$db'";
	$result = pg_query($dbconn, $query);

	if (pg_num_rows($result) == 0)
	{
		$createDbQuery = "CREATE DATABASE \"$db\"";
		if (!pg_query($dbconn, $createDbQuery))
		{
			fwrite($stderr, "\nPostgreSQL 'CREATE DATABASE' Error\n");
			pg_close($dbconn);
			exit(1);
		}
	}

	fwrite($stderr, "\nPostgreSQL Database Created\n");

	pg_close($dbconn);
}
else
{
	fwrite($stderr, "\nInvalid database type. Please provide 'pgsql' or 'mysqli'.\n");
	exit(1);
}