Voici quelques lignes de code pour modifier et améliorer WordPress. C’est un peu en vrac mais ça peut servir.
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Afficher un contenu WordPress différent si l’article est dans une catégorie spécifique
1 – Si vous connaissez l’ID de la catégorie :
if ( in_category( '1' ) ){ /* votre code */ }
2 – Pour récupérer l’ID de la catégorie grâce à son adresse (slug) :
$catslug = 'ma-categorie'; if ( in_category( get_category_by_slug($catslug)->term_id ) ){ /* votre code */ }
Récupérer l’ID d’un article WordPress grâce à son adresse (slug)
function get_ID_by_slug($post_slug) {
$post = get_post_by_path($post_slug);
if ($post) {
return $post->ID;
} else {
return null;
}
}
Pour récupérer l’ID d’une page WordPress grâce à son adresse (slug)
function get_id_by_slug($page_slug) {
$page = get_page_by_path($page_slug);
if ($page) {
return $page->ID;
} else {
return null;
}
}
Récupérer le Slug (adresse) d’un article wordpress grâce à son ID
function get_the_slug( $id=null ){
if( empty($id) ):
global $post;
if( empty($post) )
return ''; // No global $post var available.
$id = $post->ID;
endif;
$slug = basename( get_permalink($id) );
return $slug;
}
function the_slug( $id=null ){
echo apply_filters( 'the_slug', get_the_slug($id) );
}
Fonction WordPress pour récupérer le lien d’une catégorie à partir de son url (slug)
function mrsize_cat_link_by_slug($slug = NULL, $class = NULL, $text = NULL){
$cat_slug = $slug;
$cat_id = get_category_by_slug($cat_slug);
$cat_url = get_category_link($cat_id);
$cat_name = $cat_id->name;
return ''. $text .' ' . $cat_name . '';
}
Récupérer uniquement le contenu d’un article wordpress à partir de son ID
function content_by_id($id){
$content_post = get_post($id);
$content = $content_post->post_content;
$content = apply_filters('the_content', $content);
$content = str_replace(']]>', ']]>', $content);
return $content;
}
Modifier le lien « lire la suite » de WordPress
// Modify The Read More Link Text
add_filter( 'the_content_more_link', 'modify_read_more_link' );
function modify_read_more_link() {
return '';
}
Pré-définir le type de permalien de WordPress
function reset_permalinks() {
global $wp_rewrite;
$wp_rewrite->set_permalink_structure( '/%postname%/' );
}
add_action( 'init', 'reset_permalinks' );
Ajouter une class CSS à la balise body de WordPress
Pratique pour indiquer que la page n’est pas la page d’accueil :
add_filter( 'body_class','not_home_body_classes' );
function not_home_body_classes( $classes ) {
global $post;
if(is_home() || is_front_page()){
$homeClass = 'home';
} else {
$homeClass = 'nothome';
}
$classes[] = $homeClass;
return $classes;
}
Pratique pour customiser une page spécifique
Ici, on ajoute le slug de la page aux classes du body :
add_filter( 'body_class', 'tomorrow_pagename' );
if( ! function_exists('tomorrow_pagename')){
function tomorrow_pagename($pagename) {
if( ! isset($post)) global $post;
$search_query = get_search_query();
if( ! isset( $pagename )){
if( $search_query != '' ){
$pagename = 'search-results';
} else {
$pagename = $post->post_name;
}
}
return $pagename;
}
} // end - if function not exist
Ajouter une colonne avec l’image à la une dans l’administration wordpress
/* --- Start : Post Thumbnail in admin --- */
// Add the posts and pages columns filter. They can both use the same function.
add_filter('manage_posts_columns', 'tcb_add_post_thumbnail_column', 1);
add_filter('manage_pages_columns', 'tcb_add_post_thumbnail_column', 1);
// Add the column
function tcb_add_post_thumbnail_column($cols){
$cols['tcb_post_thumb'] = __('Image','sensa');
return $cols;
}
// Hook into the posts an pages column managing. Sharing function callback again.
add_action('manage_posts_custom_column', 'tcb_display_post_thumbnail_column', 1, 2);
add_action('manage_pages_custom_column', 'tcb_display_post_thumbnail_column', 1, 2);
// Grab featured-thumbnail size post thumbnail and display it.
function tcb_display_post_thumbnail_column($col, $id){
switch($col){
case 'tcb_post_thumb':
if( function_exists('the_post_thumbnail') )
echo the_post_thumbnail( 'thumb' );
else
echo __( 'Not supported in theme','sensa' );
break;
}
}
/* --- End : Post Thumbnail in admin --- */
Sécurité : Bloquer l’admin de wordpress
// redirect non admin but allow ajax access
// source : https://codex.wordpress.org/Plugin_API/Action_Reference/admin_init
function restrict_admin() {
if ( ! current_user_can( 'publish_posts' ) && ( ! defined( 'DOING_AJAX' ) || ! DOING_AJAX ) ) {
wp_redirect( site_url() );
exit;
}
}
add_action( 'admin_init', 'restrict_admin', 1 );
Sécurité : se proteger des requetes d’url malfaisantes
// Protect wordpress against malicious URL requests
// source : http://wp-snippet.com/protect-wordpress-against-malicious-url-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;
}
}
}
Optimisation : Booster la rapidité de son site wordpress en préchargeant les pages avec HTML5
add_action('wp_head', 'gkp_prefetch');
function gkp_prefetch() {
?>
<link rel="prefetch" href="" />
<link rel="prerender" href="" />
<link rel="prefetch" href="/css-minify.php" />
<link rel="prerender" href="/css-minify.php" />
<?php
}
Optimisation : Compressez le html de WordPress pour un rendu plus rapide
// Enable GZIP output compression
if(extension_loaded("zlib") && (ini_get("output_handler") != "ob_gzhandler"))
add_action('wp', create_function('', '@ob_end_clean();@ini_set("zlib.output_compression", 1);'));
// ob_start = mise en tampon
add_action('get_header', 'gkp_html_minify_start');
function gkp_html_minify_start() {
ob_start( 'gkp_html_minyfy_finish' );
}
// Minifier les fichiers HTML d'un site WordPress sans plugin
if (!current_user_can('update_plugins')) {
function gkp_html_minyfy_finish( $html ) {
// Suppression des commentaires HTML,
// sauf les commentaires conditionnels pour IE
$html = preg_replace('/).)*-->/s', '', $html);
// Suppression des espaces vides
$html = str_replace(array("\r\n", "\r", "\n", "\t"), '', $html);
while ( stristr($html, ' '))
$html = str_replace(' ', ' ', $html);
return $html;
}
}
Sécuriser les adresses e-mails de WordPress
// How to automatically hide email adresses from spambots on your WordPress blog
function security_remove_emails($content) {
$pattern = '/([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4})/i';
$fix = preg_replace_callback($pattern,"security_remove_emails_logic", $content);
return $fix;
}
function security_remove_emails_logic($result) {
return antispambot($result[1]);
}
add_filter( 'the_content', 'security_remove_emails', 20 );
add_filter( 'widget_text', 'security_remove_emails', 20 );
Masquer les e-mails avec du javascript
// masque emails
function encodeEmail($email, $name = null) {
$email = preg_replace("/\"/","\\\"",$email);
if($name == null)
$name = $email;
$old = "document.write('$name')";
$output = "";
for ($i=0; $i < strlen($old); $i++) {
$output = $output . '%' . bin2hex(substr($old,$i,1));
}
$output = 'eval(unescape(\''.$output.'\'))';
$output .= 'Il faut javascript activé pour voir l\'email';
return $output;
}
Retirer les balises Meta de WordPress
// Remove meta generator
remove_action('wp_head', 'wp_generator');
Site mobile (responsive), ajouter les balises meta
function tomorrow_add_responsive_meta_header() {
?>
<meta name="apple-mobile-web-app-title" content="">
<?php
}
add_action( 'wp_head', 'tomorrow_add_responsive_meta_header' );
Ajouter une classe CSS à the_tags()
// Ajouter une classe html à chaque tag
add_filter('the_tags', 'add_class_get_the_tag_list');
function add_class_get_the_tag_list($list) {
$list = str_replace('rel="tag">', 'rel="tag" class="tag">', $list);
$list = str_replace('', '', $list);
return $list;
}
Ajouter une Classe CSS au menu wordpress
// add class to menu
function special_nav_class($classes, $item){
$classes[] = "w menu-item fl fadeInDown wow animated";
return $classes;
}
add_filter('nav_menu_css_class' , 'special_nav_class' , 10 , 2);
Ajouter un meta canonical
// canonical
// A copy of rel_canonical but to allow an override on a custom tag
function rel_canonical_with_custom_tag_override()
{
if( !is_singular() )
return;
global $wp_the_query;
if( !$id = $wp_the_query->get_queried_object_id() )
return;
// check whether the current post has content in the "canonical_url" custom field
$canonical_url = get_post_meta( $id, 'canonical_url', true );
if( '' != $canonical_url )
{
// trailing slash functions copied from http://core.trac.wordpress.org/attachment/ticket/18660/canonical.6.patch
$link = user_trailingslashit( trailingslashit( $canonical_url ) );
}
else
{
$link = get_permalink( $id );
}
echo "\n";
}
// remove the default WordPress canonical URL function
if( function_exists( 'rel_canonical' ) )
{
remove_action( 'wp_head', 'rel_canonical' );
}
// replace the default WordPress canonical URL function with your own
add_action( 'wp_head', 'rel_canonical_with_custom_tag_override' );
Savoir si c’est une sous-page « if(is_subpage()){} »
// subpage
function is_subpage( $page = null )
{
global $post;
// is this even a page?
if ( ! is_page() )
return false;
// does it have a parent?
if ( ! isset( $post->post_parent ) OR $post->post_parent post_parent == $page )
return true;
} else if ( is_string( $page ) ) {
// get ancestors
$parent = get_ancestors( $post->ID, 'page' );
// does it have ancestors?
if ( empty( $parent ) )
return false;
// get the first ancestor
$parent = get_post( $parent[0] );
// compare the post_name
if ( $parent->post_name == $page )
return true;
}
return false;
}
}
Administration WordPress
Afficher plus de pages dans votre administration
// display number of pages in admin
add_filter( 'get_user_metadata', 'pages_per_page_wpse_23503', 10, 4 );
function pages_per_page_wpse_23503( $check, $object_id, $meta_key, $single )
{
if( 'edit_page_per_page' == $meta_key )
return 2000;
return $check;
}
Masquer la barre d’administration sauf pour les administrateurs
// Disable Admin Bar for All Users Except for Administrators
add_action('after_setup_theme', 'remove_admin_bar');
function remove_admin_bar() {
if (!current_user_can('administrator') && !is_admin()) {
show_admin_bar(false);
}
}
Modifier le texte dans le footer de l’admin
// custom footer text
function remove_footer_admin () {
echo 'Une question, besoin d\'aide ? Contactez thomas';
}
add_filter('admin_footer_text', 'remove_footer_admin');
Supprimer le lien vers les commentaires dans la barre d’administration WordPress
// Disable support for comments and trackbacks in post types
function remove_admin_bar_links() {
global $wp_admin_bar;
$wp_admin_bar->remove_menu('comments');
}
add_action( 'wp_before_admin_bar_render', 'remove_admin_bar_links' );
Ajouter un lien vers dans la barre d’administration WordPress
function my_admin_bar_menu() {
global $wp_admin_bar;
if ( !is_super_admin() || !is_admin_bar_showing() )
return;
$wp_admin_bar->add_menu( array(
'id' => 'custom_menu',
'title' => __( 'Page title'),
'href' => FALSE ));
$wp_admin_bar->add_menu( array(
'parent' => 'custom_menu',
'title' => __( 'Theme Options'),
'href' => admin_url( 'themes.php?page=options-framework' )) );
}
add_action('admin_bar_menu', 'my_admin_bar_menu');
Forcer l’affichage en une colonne dans l’administration
// force 1 column on dashboard
function so_screen_layout_columns( $columns ) {
$columns['dashboard'] = 1;
return $columns;
}
add_filter( 'screen_layout_columns', 'so_screen_layout_columns' );
function so_screen_layout_dashboard() {
return 1;
}
add_filter( 'get_user_option_screen_layout_dashboard', 'so_screen_layout_dashboard' );
Désactiver les notifications de mise à jour
// remove upgrade notification
function my_remove_update_notifications() {
global $current_user;
get_currentuserinfo();
if($current_user->user_login != 'admin'){
add_action( 'admin_notices', 'update_nag', 3 );
add_action( 'init', create_function( '$a', "remove_action( 'init', 'wp_version_check' );" ), 2 );
add_filter( 'pre_option_update_core', create_function( '$a', "return null;" ) );
}
}
Definir la couleur par défaut de l’admin WordPress
function set_default_admin_color($user_id) {
$args = array(
'ID' => $user_id,
'admin_color' => 'sunrise'
);
wp_update_user( $args );
}
add_action('user_register', 'set_default_admin_color');
Changer l’ordre du menu dans l’administration
// Move Pages above Media
function mrsize_change_menu_order( $menu_order ) {
return array(
'index.php',
'edit.php',
'edit.php?post_type=page',
'edit.php?post_type=mini_slide',
'edit.php?post_type=home_blocs',
'upload.php',
);
}
add_filter( 'custom_menu_order', '__return_true' );
add_filter( 'menu_order', 'mrsize_change_menu_order' );
Retirer des menus ou enlever des sous-menus dans l’administration WordPress
function mrsize_remove_admin_menus(){
// Check that the built-in WordPress function remove_menu_page() exists in the current installation
if ( function_exists('remove_menu_page') ) {
remove_submenu_page( 'themes.php', 'widgets.php' );
remove_submenu_page( 'themes.php', 'customize.php' );
remove_submenu_page( 'themes.php', 'theme-editor.php' );
remove_menu_page( 'theme-editor.php' );
remove_submenu_page( 'plugins.php', 'plugin-editor.php' );
}
}
// Add our function to the admin_menu action
add_action('admin_menu', 'mrsize_remove_admin_menus');
Recupérer la liste des tags utilisés dans une categorie
function get_tags_in_use($category_ID, $type = 'name'){
// Set up the query for our posts
$my_posts = new WP_Query(array(
'cat' => $category_ID, // Your category id
'posts_per_page' => -1 // All posts from that category
));
// Initialize our tag arrays
$tags_by_id = array();
$tags_by_name = array();
$tags_by_slug = array();
// If there are posts in this category, loop through them
if ($my_posts->have_posts()): while ($my_posts->have_posts()): $my_posts->the_post();
// Get all tags of current post
$post_tags = wp_get_post_tags($my_posts->post->ID);
// Loop through each tag
foreach ($post_tags as $tag):
// Set up our tags by id, name, and/or slug
$tag_id = $tag->term_id;
$tag_name = $tag->name;
$tag_slug = $tag->slug;
// Push each tag into our main array if not already in it
if (!in_array($tag_id, $tags_by_id))
array_push($tags_by_id, $tag_id);
if (!in_array($tag_name, $tags_by_name))
array_push($tags_by_name, $tag_name);
if (!in_array($tag_slug, $tags_by_slug))
array_push($tags_by_slug, $tag_slug);
endforeach;
endwhile; endif;
// Return value specified
if ($type == 'id')
return $tags_by_id;
if ($type == 'name')
return $tags_by_name;
if ($type == 'slug')
return $tags_by_slug;
}
Créer un nuage de tags, à partir des tags utilisés dans une categorie
function tag_cloud_by_category($category_ID){
// Get our tag array
$tags = get_tags_in_use($category_ID, 'id');
// Start our output variable
echo '';
// Cycle through each tag and set it up
foreach ($tags as $tag):
// Get our count
$term = get_term_by('id', $tag, 'post_tag');
$count = $term->count;
// Get tag name
$tag_info = get_tag($tag);
$tag_name = $tag_info->name;
// Get tag link
$tag_link = get_tag_link($tag);
// Set up our font size based on count
$size = 8 + $count;
echo '';
echo ''.$tag_name.'';
echo ' ';
endforeach;
echo '';
}
Ajouter une classe CSS au Excerpt
add_filter( "the_excerpt", "add_class_to_excerpt" );
function add_class_to_excerpt( $excerpt ) {
return str_replace('<p', '<p class="excerpt"', $excerpt);
}
Un excerpt personnalisé
// custom excerpt
function excerpt($limit) {
$excerpt = explode(' ', get_the_excerpt(), $limit);
if (count($excerpt)>=$limit) {
array_pop($excerpt);
$excerpt = implode(" ",$excerpt).'...';
} else {
$excerpt = implode(" ",$excerpt);
}
$excerpt = preg_replace('`\[[^\]]*\]`','',$excerpt);
return '' . $excerpt . '
';
}
function content($limit) {
$content = explode(' ', get_the_content(), $limit);
if (count($content)>=$limit) {
array_pop($content);
$content = implode(" ",$content).'...';
} else {
$content = implode(" ",$content);
}
$content = preg_replace('/\[.+\]/','', $content);
$content = apply_filters('the_content', $content);
$content = str_replace(']]>', ']]>', $content);
return $content;
}
Fonction de base WordPress : ajouter un textdomain
';
// Cycle through each tag and set it up
foreach ($tags as $tag):
// Get our count
$term = get_term_by('id', $tag, 'post_tag');
$count = $term->count;
// Get tag name
$tag_info = get_tag($tag);
$tag_name = $tag_info->name;
// Get tag link
$tag_link = get_tag_link($tag);
// Set up our font size based on count
$size = 8 + $count;
echo '';
echo ''.$tag_name.'';
echo ' ';
endforeach;
echo '
';
}
' . $excerpt . '
'; } function content($limit) { $content = explode(' ', get_the_content(), $limit); if (count($content)>=$limit) { array_pop($content); $content = implode(" ",$content).'...'; } else { $content = implode(" ",$content); } $content = preg_replace('/\[.+\]/','', $content); $content = apply_filters('the_content', $content); $content = str_replace(']]>', ']]>', $content); return $content; }Utile pour rendre un site traduisible
add_action('after_setup_theme', 'my_theme_setup');
function my_theme_setup(){
load_theme_textdomain('sensa', get_template_directory() . '/languages');
}
Changer le permalien des auteurs WordPress
if ( ! function_exists('change_author_permalinks')){
add_action('init','change_author_permalinks');
function change_author_permalinks()
{
global $wp_rewrite;
$wp_rewrite->author_base = 'u'; // Change 'member' to be the base URL you wish to use
$wp_rewrite->author_structure = '/' . $wp_rewrite->author_base. '/%author%';
}
}
Retirer les styles par defaut de wp-caption
add_shortcode('wp_caption', 'fixed_img_caption_shortcode');
add_shortcode('caption', 'fixed_img_caption_shortcode');
function fixed_img_caption_shortcode($attr, $content = null) {
if ( ! isset( $attr['caption'] ) ) {
if ( preg_match( '#((?:]+>\s*)?![]()
]+>(?:\s*)?)(.*)#is', $content, $matches ) ) {
$content = $matches[1];
$attr['caption'] = trim( $matches[2] );
}
}
$output = apply_filters('img_caption_shortcode', '', $attr, $content);
if ( $output != '' )
return $output;
extract(shortcode_atts(array(
'id' => '',
'align' => 'alignnone',
'width' => '',
'caption' => ''
), $attr));
if ( 1 > (int) $width || empty($caption) )
return $content;
if ( $id ) $id = 'id="' . esc_attr($id) . '" ';
return '' . do_shortcode( $content ) . '' . $caption . '
';
}
Ajouter automatiquement target= »_blank » aux liens externes sur WordPress
function wpi_linktarget($content)
{
return preg_replace_callback('/]+/', 'wpi_linktarget_callback', $content);
}
function wpi_linktarget_callback($matches)
{
$link = $matches[0];
$site_link = get_bloginfo('url');
if (strpos($link, 'target') === false)
{
$link = preg_replace("%(href=\S(?!$site_link))%i", 'target="_blank" $1', $link);
}
elseif (preg_match("%href=\S(?!$site_link)%i", $link))
{
$link = preg_replace('/target=S(?!_blank)\S*/i', 'target="_blank"', $link);
}
return $link;
}
add_filter('the_content', 'wpi_linktarget');
Inscrire automatiquement un nouvel e-mail dans une liste Wysija (Mailpoet) à l’envoi d’un e-mail avec CF7 (Contact Form 7)
function wysija_contactform7_subscribe($cfdata) {
$formdata = $cfdata->posted_data;
/* if you use different name/id attribute for CF7 - please change 'your-name' and 'your-email'*/
$user_name = $formdata['your-name'];
$user_email = $formdata['your-email'];
/* change this according to your user list id you want this user to subscribe */
$listID = array( '1', '3' );
$userData=array(
'email' => $user_email,
'firstname' => $user_name,
'birth_date' => $birth_date
);
$data=array(
'user' => $userData,
'user_list' => array( 'list_ids'=> $listID )
);
$userHelper=&WYSIJA::get('user','helper');
$userHelper->addSubscriber($data);
}
add_action('wpcf7_mail_sent', 'wysija_contactform7_subscribe', 1);