How Can I Check if a String Contains a Specific Word in PHP?

How to Check if a String Contains a Specific Word

In PHP, determining whether a string contains a particular word can be achieved through various methods.

PHP 8 and str_contains

With PHP 8, the str_contains function can be used:

if (str_contains('How are you', 'are')) {
    echo 'true';
}

Note that str_contains returns true even if the searched substring ($needle) is empty. To prevent this, ensure that $needle is not empty before the check:

$haystack = 'How are you?';
$needle   = '';

if ($needle !== '' && str_contains($haystack, $needle)) {
    echo 'true';
}

Pre-PHP 8 and strpos

Prior to PHP 8, the strpos function can be used:

$haystack = 'How are you?';
$needle   = 'are';

if (strpos($haystack, $needle) !== false) {
    echo 'true';
}

Considerations

• strpos returns the offset of the first occurrence of the substring, or false if not found. To check for existence, compare the result to false.
• str_contains is case-sensitive.

The above is the detailed content of How Can I Check if a String Contains a Specific Word in PHP?. For more information, please follow other related articles on the PHP Chinese website!