regex string contains character php code example

Example 1: php find if string contains

if (strpos($string, 'substring') !== false) {
	// do stuff 
}

Example 2: check if string contains character php

// this method is new with PHP 8 and above
$haystack = "Damn, I wonder if this string contains a comma.";
if (str_contains($haystack, ",")) {
	echo "There is a comma!!";
}