Blog Web & Design

WordPress, bouts de codes utiles

Voici quelques lignes de code pour modifier et améliorer WordPress. C’est un peu en vrac mais ça peut servir.

Besoin d’un spécialiste WordPress pour votre projet ? Contactez-moi

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 :

Besoin d’un spécialiste WordPress pour votre projet ? Contactez-moi

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

Besoin d’un spécialiste WordPress pour votre projet ? Contactez-moi

// 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

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);
Dernière mise à jour le Auteur : Thomas Dufranne

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