if value conatins in word check in php

<?php
$word = "fox";
$mystring = "The quick brown fox jumps over the lazy dog";
 
// Test if string contains the word 
if(strpos($mystring, $word) !== false){
    echo "Word Found!";
} else{
    echo "Word Not Found!";
}
?>

// returns true if $needle is a substring of $haystack
function contains($haystack, $needle){
    return strpos($haystack, $needle) !== false;
}