[Fix] strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated

Since PHP 8.1, passing null to parameter #1 is deprecated.

Example: when using strpos() to find the occurrence of the specific word in the string.

$contains = 'are';

if (strpos( $value, $contins) !== false) {
    echo 'true';
}

In case of $value being null — the above deprecated message will appear.

Fix:

– Make sure the 1st parameter is a string.

or,

if ( $value && strpos( $value, $contins) !== false) {
      echo 'true';
}

Did you know? In str_replace(), passing null to parameter #3 ($subject) of type array|string is deprecated