if (strpos($string, 'substring') !== false) { // do stuff }
// returns true if $needle is a substring of $haystack function contains($haystack, $needle){ return strpos($haystack, $needle) !== false; }
if (preg_match('/[A-Za-z]/', $myString) && preg_match('/[0-9]/', $myString)) { echo 'Contains at least one letter and one number'; }