Array Remove By Value in PhP

<?php
    // Array Remove By Value
    // https://stackoverflow.com/questions/8668826/search-and-replace-value-in-php-array
    $array = [
        'p_1',
        'p_2',
        's_1',
        'p_4',
    ];

    $post_remove = array('p_1', 'p_2', 'p_3', 'p_4');

    $a = array_values(array_diff($array, $remove));

    echo '<pre>', var_export($a), '</pre>';
?>