WordPress代码实现自动拒绝包含特定关键词的垃圾评论

function in_comment_post_like($string, $array) {
    foreach($array as $ref) { if(strstr($string, $ref)) { return true; } }
    return false;
}
function drop_bad_comments() {
    if (!empty($_POST['comment'])) {
        $post_comment_content = $_POST['comment'];
        $lower_case_comment = strtolower($_POST['comment']);
        $bad_comment_content = array(
            'viagra',
            'hydrocodone',
            'hair loss',
            'xanax',
            'tramadol',
            'russian girls',
            'russian brides',
            'lorazepam',
            'adderall',
            'dexadrine',
            'no prescription',
            'oxycontin',
            'without a prescription',
            'sex pics',
            'family incest',
            'online casinos',
            'online dating',
            'cialis',
            'best forex',
            'amoxicillin'
        );
        if (in_comment_post_like($lower_case_comment, $bad_comment_content)) {
            $comment_box_text = wordwrap(trim($post_comment_content), 80, "\n  ", true);
            $txtdrop = fopen('/var/log/httpd/wp_post-logger/nullamatix.com-text-area_dropped.txt', 'a');
            fwrite($txtdrop, "  --------------\n  [COMMENT] = " . $post_comment_content . "\n  --------------\n");
            fwrite($txtdrop, "  [SOURCE_IP] = " . $_SERVER['REMOTE_ADDR'] . " @ " . date("F j, Y, g:i a") . "\n");
            fwrite($txtdrop, "  [USERAGENT] = " . $_SERVER['HTTP_USER_AGENT'] . "\n");
            fwrite($txtdrop, "  [REFERER  ] = " . $_SERVER['HTTP_REFERER'] . "\n");
            fwrite($txtdrop, "  [FILE_NAME] = " . $_SERVER['SCRIPT_NAME'] . " - [REQ_URI] = " . $_SERVER['REQUEST_URI'] . "\n");
            fwrite($txtdrop, '--------------**********------------------'."\n");
            header("HTTP/1.1 406 Not Acceptable");
            header("Status: 406 Not Acceptable");
            header("Connection: Close");
            wp_die( __('bang bang.') );
        }
    }
}
add_action('init', 'drop_bad_comments');