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My PHP version is 8.1.23 and I am seeing a deprecated notice. I have adapted this code and it got resolved but please fix it in the next update:
/**
* Check if key is valid
*
* @param $key
*
* @return bool
*/
public static function keyIsValid( $key ) {
return is_string( $key ) && ! preg_match( '/[^\p{L}\p{N}\:\.\_\s\-]+/u', $key );
}