php check if a string contains some string code example

Example 1: php find if string contains

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

Example 2: How do I check if a string contains a specific word?

$a = 'Hello world?';

if (strpos($a, 'Hello') !== false) { //PAY ATTENTION TO !==, not !=
    echo 'true';
}
if (stripos($a, 'HELLO') !== false) { //Case insensitive
    echo 'true';
}