Create a random string

This snippet will return a string with each time different characters.
String can contain:

• Uppercase characters
• Lowercase characters
• Numbers (0-9)

Example of use:

$str = random_chars(15);

function random_chars($length)
{
	$allowed_lower = range('a', 'z'); $allowed_upper = range('A', 'Z');
	$allowed_num = range(0, 9); 

	$all = array_merge($allowed_lower, $allowed_upper, $allowed_num);

	$random = '';

	for ($a = 0; $a < $length; $a++)
	{
		$rand = rand(0, count($all)-1);
		$random .= $all[$rand];
	}

	return $random;
}

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