How do you determine if a string contains a specific word in PHP?

Determining String Inclusion with PHP

You seek a PHP function that evaluates if a given word exists within a provided string. Let's delve into the options available:

1. strpos() and stripos() Method: This method operates by searching for the needle (the word to be found) within the haystack (the larger string). stripos() performs a case-insensitive search.

$haystack = "I go to school";
$needle = "to";

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

2. strstr() and stristr(): This method also searches for the needle within the haystack, but it returns the remaining string as well.

if (strstr($haystack, $needle)) {
    echo "Found!"
}

3. preg_match(): This regular expression approach provides more flexibility but is less performant.

if (preg_match("/{$needle}/", $haystack)) {
    echo "Found!"
}

4. match_my_string Function: This function encapsulates the strpos() method:

function match_my_string($needle = 'to', $haystack = 'I go to school') {
    if (strpos($haystack, $needle) !== false) return true;
    else return false;
}

match_my_string($needle, $haystack);

5. str_contains (PHP 8.0.0 ): This function offers a concise way to perform the same task:

$haystack = "I go to school";
$needle = "to";

if (str_contains($haystack, $needle)) {
    echo "Found!"
}

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