[WordPress] - Collection of WordPress Snippets

admin.php

<?php
    // Show something only if the user is logged / admin.
    // To be used in the current theme files - front.
    
    if (current_user_can('manage_options')){ ?>
    <div class="work">
        <div class="work_layer">
            <div class="device-content row">
                <div class="work_content right">
                    <span class="f_13 uppercase sub_title">Web</span>
                    <h2 class="grey_dark medium">Perturbator.</h2>
                    <h4 class="grey_dark times">Wesite for Perturbator,<br>a music artist inspired by the 80's.</h4>
                    <a href="/perturbator/" class="link uppercase grey_dark">See project</a>
                </div>
            </div>
        </div>
        <img src="<?php echo get_template_directory_uri(); ?>/includes/images/uploads/perturbator.jpg" alt=""> 
    </div>
<?php } ?>

ajax_request.php

<?php
    // Detect an Ajax request using PHP.
    // Ex: To be used in the current theme's single.php file to make ajax calls between articles...
    
    if (!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest' ){
        // This is an Ajax request
    }
    else{
        get_header();
    }
    
    echo '<article class="article-content">';
        
    echo '</article>';
?>

custom_background.php

<?php
    // A custom background-image for your WordPress theme.
    // To be used in the current theme's functions.php file.
    
    $args = array(
        'default-color' => 'F5F5F5',
        'default-image' => get_template_directory_uri() . '/images/default-bg.jpg',
    );
    add_theme_support('custom-background',$args);
?>

custom_dashboard_widget.php

<?php
    // A custom widget for your WordPress Dashboard.
    // In this example, we have a table called wp_email in the database
    // Works with any loops : posts, etc.
    
    function custom_dashboard_widget() {
        
        global $wpdb; // http://codex.wordpress.org/Class_Reference/wpdb
        
        $emails = $wpdb->get_results("SELECT mail FROM wp_email");
        
        if($emails){
            foreach ($emails as $mail) {
                echo $email->mail.'<br>';
                echo '<hr>';
            }  
        }
        
        die();
        
    }
    function add_custom_dashboard_widget() {
        wp_add_dashboard_widget('custom_dashboard_widget', 'Espace Pro : Emails', 'custom_dashboard_widget');
    }
    add_action('wp_dashboard_setup', 'add_custom_dashboard_widget');
?>

custom_taxonomy.php

<?php
    // You can add new taxonomies (such as categories) in WordPress.
    // For example, create a taxonomy named 'Clients'.
    // You'll be able to filter your posts by clients !
    // To be used in the current theme's functions.php file.
    
    // Option : add a thumbnail image to every items listed in 'Clients'. — http://wordpress.org/plugins/taxonomy-images/

    add_action('init', 'clients_init',0); // Here I call a function, defined right after this.
    
    // My function clients_init();
    function clients_init() {
        $labels = array(
            'name' => _x( 'Clients', 'taxonomy general name'),
            'singular_name' => _x('Client','taxonomy singular name'),
            'search_items' =>  __('Search for clients'),
            'popular_items' => __('Popular clients'),
            'all_items' => __('All clients'),
            'parent_item' => null,
            'parent_item_colon' => null,
            'edit_item' => __('Edit client'), 
            'update_item' => __('Update client'),
            'add_new_item' => __('Add new client'),
            'new_item_name' => __('New client name'),
            'separate_items_with_commas' => __('Separate clients with commas'),
            'add_or_remove_items' => __('Add or remove clients'),
            'choose_from_most_used' => __('Choose from most used'),
            'menu_name' => __('Clients'),
        );
        
        register_taxonomy('clients','post',array(
            'hierarchical' => true,
            'labels' => $labels,
            'show_ui' => true,
            'show_admin_column' => true,
            'update_count_callback' => '_update_post_term_count',
            'query_var' => true,
            'rewrite' => array('slug' => 'clients'),
        ));
    }
?>


<?php
    // get_terms to display the taxonomy terms inside your theme
    // You're not in functions.php anymore !
    
    $taxonomy = 'clients';
    $tax_terms = get_terms($taxonomy);
    foreach ($tax_terms as $tax_term) {
	echo '<a href="#" data-slug="' . $tax_term->slug . '">' . $tax_term->name.'</a>';
    }
?>

editor_styles.php

<?php
    // A tumbnail image for your WordPress theme.
    // To be used in the current theme's functions.php file.
    
    function my_theme_add_editor_styles() {
       add_editor_style('custom-editor-style.css');
    }
    add_action('init', 'my_theme_add_editor_styles');
?>

filter_by_category_name.php

<?php
    // Filter posts by category name.
    // With this, you're able to filter 'blog' posts and 'work' posts (for example)
    // This is interesting if you need two (or more) different lists of posts.
    
    $args=array(
        'post_type'        => 'post',     // You want the posts, not pages.
        'post_status'      => 'publish',  // c'mon...
        'category_name'    => 'blog',     // change the category name here.
        'posts_per_page'   => -1,         // loop all posts.
        'orderby'          => 'post_date' // do you really need me to explain that??
    );
    $list_of_posts=new WP_Query($args); 
    
    while($list_of_posts->have_posts()):$list_of_posts->the_post();
    
        // echo whatever you want !
        echo'<a href="'; the_permalink(); echo'" class="blog-post">';
            the_title();
        echo'</a>';
        
    endwhile;
?>

filter_by_common_tags.php

<?php
    $tags = wp_get_post_tags($post->ID);
    $what_tag = array();
    if($tags){
        foreach ($tags as $tag) :
            $what_tag[] = $tag->term_id;
        endforeach;
    }
?>
<?php if($tags){
    $args=array(
        'post_type'        => 'post',
        'post_status'      => 'publish',
        'posts_per_page'   => 3,
        'post__not_in'     => array($post->ID),
        'tax_query'        => array(
            'relation' => 'AND',
            array(
                'taxonomy' => 'category',
                'terms'    => array(1,3),
                'field'    => 'id',
                'operator' => 'IN',
            ),
            array(
                'taxonomy' => 'post_tag',
                'terms'    => $what_tag,
                'field'    => 'id',
                'operator' => 'IN',
            ),
        ),
    );
    $my_query = new WP_Query($args);
    
    if($my_query->have_posts()){ 
    while($my_query->have_posts()) : $my_query->the_post(); ?>
        <a href="<?php the_permalink(); ?>"></a>
    <?php endwhile;
    
    wp_reset_postdata();
} ?>

header.php

<!DOCTYPE html>
<html>
<head>
<meta charset="<?php bloginfo('charset'); ?>">
<?php require_once get_template_directory()."/theme_functions.php"; ?>
<meta name="description" content="">
<meta name="keywords" content="">
<meta name="author" content="">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, maximum-scale=1">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">

<meta property="og:type" content="website">
<meta property="og:title" content="">
<meta property="og:url" content="">
<meta property="og:image" content="<?php echo get_template_directory_uri(); ?>/includes/images/og_image.png">
<meta property="og:image:width" content="450">
<meta property="og:image:height" content="450">
<meta property="og:description" content="">

<meta name="twitter:card" content="summary">
<meta name="twitter:site" content="">
<meta name="twitter:title" content="">
<meta name="twitter:description" content="">
<meta name="twitter:creator" content="">
<meta name="twitter:image:src" content="">
<meta name="twitter:domain" content="">

<title><?php global $page, $paged; wp_title('|', true, 'right'); bloginfo('name'); $site_description = get_bloginfo('description','display'); if ($site_description && (is_home() || is_front_page())) echo " | $site_description";if ($paged >= 2 || $page >= 2)echo ' | ' . sprintf( __('Page %s', 'toolbox'), max($paged, $page)); ?></title>

<!--[if lt IE 9]>
	<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->

<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-startup-image-320x480.png" media="(device-width: 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 1)" rel="apple-touch-startup-image">
<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-startup-image-640x960.png" media="(device-width: 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-startup-image-640x1096.png" media="(device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-startup-image-768x1004.png" media="(device-width: 768px) and (device-height: 1024px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 1)" rel="apple-touch-startup-image">
<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-startup-image-1024x748.png" media="(device-width: 768px) and (device-height: 1024px) and (orientation: landscape) and (-webkit-device-pixel-ratio: 1)" rel="apple-touch-startup-image">
<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-startup-image-1536x2008.png" media="(device-width: 768px) and (device-height: 1024px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">
<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-startup-image-2048x1496.png" media="(device-width: 768px) and (device-height: 1024px) and (orientation: landscape) and (-webkit-device-pixel-ratio: 2)" rel="apple-touch-startup-image">

<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-icon-57x57.png" sizes="57x57" rel="apple-touch-icon-precomposed">
<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-icon-72x72.png" sizes="72x72" rel="apple-touch-icon-precomposed">
<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-icon-114x114.png" sizes="114x114" rel="apple-touch-icon-precomposed">
<link href="<?php echo get_template_directory_uri(); ?>/includes/images/apple-touch-icon-144x144.png" sizes="144x144" rel="apple-touch-icon-precomposed">

<link rel="shortcut icon" href="<?php echo get_template_directory_uri(); ?>/includes/images/favicon.ico">

<?php if (is_singular() && get_option('thread_comments')) wp_enqueue_script('comment-reply'); ?>
<?php wp_head(); ?>
</head>
<body>

include_file.php

<?php
  // Include Any File From Your Theme
  // http://css-tricks.com/snippets/wordpress/include-any-file-from-your-theme/
  include (TEMPLATEPATH . '/your-file.php');
?>

menu.php

<?php
    // A custom, editable menu for your WordPress theme.
    // To be used in the current theme's functions.php file.
    
    function register_menu() {
    	// Add the header-menu to Apparence > Menus
    	register_nav_menu('header-menu',__('Header'));
    }
    add_action('init','register_menu');
?>

post_type.php

<?php
    // A custom post type.
    // To be used in the current theme's functions.php file.
    
    add_action('init','create_post_type');
    function create_post_type() {
        register_post_type('direct',
            array(
                'labels' => array(
                    'name' => __('Direct'),
                    'singular_name' => __('Direct')
                ),
                'public' => true,
                'has_archive' => true,
            )
        );
    }
?>

posts_link_addClass.php

<?php 
    // Add class to links generated by next_posts_link and previous_posts_link
    // http://css-tricks.com/snippets/wordpress/add-class-to-links-generated-by-next_posts_link-and-previous_posts_link/
    // To be used in the current theme's functions.php file.
    add_filter('next_posts_link_attributes', 'posts_link_attributes');
    add_filter('previous_posts_link_attributes', 'posts_link_attributes');
    
    function posts_link_attributes() {
        return 'class="styled-button"';
    }
?>

search.php

<?php
    // Template for WordPress search.
    // First, make the query based on the search.
    // Then, if there is results, do the loop.

    global $query_string;
    $query_args = explode("&", $query_string);
    $search_query = array(); // If you want more options... ('post_type' => 'post') [...]
    
    foreach($query_args as $key => $string) {
        $query_split = explode("=", $string);
        $search_query[$query_split[0]] = urldecode($query_split[1]);
    }
    $search = new WP_Query($search_query); // Make the query.

    // Get the number of results.
    global $wp_query;
    $total_results = $wp_query->found_posts; // echo $total_results;

    // The loop, if there is results.
    if (have_posts()) : while (have_posts()) : the_post();
        // Results! echo whatever you want !
        echo '<a href="'.the_permalink().'">'.get_the_title().'</a>';
    endwhile; else:
        // No results!
        echo '<p>Sorry, no posts matched your criteria.</p>';
    endif;
?>

thumbnail.php

<?php
    // A tumbnail image for your WordPress theme.
    // To be used in the current theme's functions.php file.
    
    if (function_exists('add_theme_support')){
        // Add the theme support.
        add_theme_support('post-thumbnails',array('post')); 
    
        // Set the default featured image dimensions (width, height, crop)
        set_post_thumbnail_size(280, 160); 
        set_post_thumbnail_size(280, 160, true); // Crop mode, true.
        
        // Registers a new image size.
        // WordPress will create a copy of the thumbnail with the specified dimensions when you upload a new image.
        add_image_size('slide-img', 900, 335); 
    }
    
    // Same image, different sizes. This is interesting if you have a grid presentation & a slider, for example.
    // To use it, simply paste this into your loop:
    // echo the_post_thumbnail('slide-img');
?>