Someone

$string = "5eviltext";$count = strlen($string);$charPool = array_merge(range('a','z'), range('A', 'Z'), range('0', '9'));for ( $i = 0; $i < $count; $i++ ) {	if ( in_array($string[$i], $charPool) != false ) {		echo $string[$i]."\r\n";		$cleanstring .= $string[$i];	} else {		echo 'invalid '.$string[$i]."\r\n";	}}