how to check if text is in a string php code example

Example 1: php check if string contains word

$myString = 'Hello Bob how are you?';
if (strpos($myString, 'Bob') !== false) {
    echo "My string contains Bob";
}

Example 2: php find if string contains

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