How to check word exist in string or not in PHP?

I want to share this posts because when i was working in my laravel application i need to find word from string, I mean check string contains word or not but i try to do, at last i found two way we can check easily. First one using preg_match and other one strpos() of php predefine. if you have question how to php regular expression match word then you can do this way:

Example 1:

$str = "Hi, I am from itsolutionstuff.com";
if (strpos($str, "from") !== false) {
    print_r("Yes, exists");
}

Example 2:

$str = "Hi, I am from itsolutionstuff.com";
$result = preg_match("from", $str);
if($result == 1){
	print_r("Yes, exists");
}