how to check word is availabl in str in 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: if text contains word then in php

if (strpos($haystack,$needle) !== false) {
    echo "$haystack contains $needle";
}