$names = array("Maria", "Jhon", "John", 777, "Michael");

    foreach ($names as $check) {
        if(is_string($check)) {
            echo "This is a string: ". $check. "
";
        } else {
            echo "This is not a string: ".$check. "
";
        }
    }

// using foreach and is_string menthods
// If you want to check an array if it contains number or not