Welcome to Maxime Mettey - WP Functions & Snippets

Author: Maxime Mettey contact@maxime-mettey.com

Warning and disclaimer

Please read carefully all this documentation file before using. This code turns off and alterate some standard behaviours on Wordpress. It is designed to suit my own developing habits on a Wordpress website. You may need to adjust it to your needs, maybe using some parts of this code only.

License

GNU GPL

Install

1. Copy the file maximemettey_wp_functions.php
2. Paste it in your child / custom Wordpress theme folder [WordpressRootFolder]/wp-content/themes/[YourTheme]/
3. Add this code at the end of the functions.php file in your theme folder :

require 'maximemettey_wp_functions.php';

N.B. : You can also just copy the snippets you want to use, and paste them in your own code.

Project layout

• maximemettey_wp_functions.php

List of functions and snippets available

Security snippets

Snippet n°1 :

Disable login error messages to prevent hackers from finding informations using brute-force attacks on the login page.

function no_wordpress_errors_on_login()
{
    return __('Login error.');
}
add_filter('login_errors', 'no_wordpress_errors_on_login');

Snippet n°2 :

Automatically reject suspicious requests.

global $user_ID;
if ($user_ID) {
    if (!current_user_can('administrator')) {
        if (
            strlen($_SERVER['REQUEST_URI']) > 255 ||
            stripos($_SERVER['REQUEST_URI'], "eval(") ||
            stripos($_SERVER['REQUEST_URI'], "CONCAT") ||
            stripos($_SERVER['REQUEST_URI'], "UNION+SELECT") ||
            stripos($_SERVER['REQUEST_URI'], "base64")
        ) {
            @header("HTTP/1.1 414 Request-URI Too Long");
            @header("Status: 414 Request-URI Too Long");
            @header("Connection: Close");
            @exit;
        }
    }
}

Snippet n°3 :

Disable XML RPC protocol from Wordpress. If you do not need it, it is safer.

add_filter('xmlrpc_enabled', '__return_false');

---

Performance snippets

Snippet n°1 :

Automatic empty trash after five days - You can adjust this number if needed.

define('EMPTY_TRASH_DAYS', 5);

Snippet n°2 :

Limit post revisions to five - You can adjust this number if needed.

define('WP_POST_REVISIONS', 5);

---

Useful and time saving snippets

Snippet n°1 :

Hide edit post link on the front. THis prevents your design from breaking when you are logged in.

function hide_edit_post_link()
{
    return false;
}
add_filter('edit_post_link', 'hide_edit_post_link', 999, 3);

Snippet n°2 :

Disable Wordpress dashboard welcome panel.

remove_action('welcome_panel', 'wp_welcome_panel');

Snippet n°3 :

Automatically format and generate the "tel" link for link tags

function telLink(string $phoneNumber)
{
    return 'tel:' . str_replace([' ', '(0)'], '', $phoneNumber);
}

Snippet n°4 :

Only useful for the Advanced Custom Fields plugin users. Automatically generates the link title for an ACF link field. By order of priority : 1. Get the link title in the link array 2. Get the post's by URL

function get_link_title_from_acf_array($link)
{
    $smtitle = $link['lien']['title'];
    if (empty($smtitle)) {
        $urlpost = url_to_postid($link['lien']['url']);

        if ($urlpost > 0) {
            $smtitle = get_the_title($urlpost);
        }
    }

    return $smtitle;
}

Snippet n°5 :

Only useful for the Advanced Custom Fields plugin users. Automatically generates a link tag for an ACF link field.

function generate_link_tag_from_acf_array($link, $class = '')
{
    return '
        <a
            href="' . $link['lien']['url'] . '"
            target="' . $link['lien']['target'] . '"
            class="' . $class . '"
        >
            ' . get_link_title($link) . '
        </a>
    ';
}