10 Essential WordPress Snippets

Adding Shortcuts to WordPress toolbar

Adding the following short code into your functions.php file will let you add shortcuts to your WordPress toolbar.

// add a link to the WP Toolbar

function custom_toolbar_link($wp_admin_bar) {

            $args = array(

                        'id' => 'gmail',

                        'title' => 'Gmail',

                        'href' => 'https://mail.google.com/mail/#inbox',

                        'meta' => array(

                                    'class' => 'gmail',

                                    'title' => 'sales@digwp.com'

                                    )

            );

            $wp_admin_bar->add_node($args);

}

add_action('admin_bar_menu', 'custom_toolbar_link', 999);

// add a link to the WP Toolbar

function custom_toolbar_link($wp_admin_bar) {

$args = array(

'id' => 'gmail',

'title' => 'Gmail',

'href' => 'https://mail.google.com/mail/#inbox',

'meta' => array(

'class' => 'gmail',

'title' => 'sales@digwp.com'

)

);

$wp_admin_bar->add_node($args);

}

add_action('admin_bar_menu', 'custom_toolbar_link', 999);

Source: Jeff Starr

Display pingbacks/trackbacks count within admin post columns

Adding the following code in your functions.php file will let you display pingbacks/trackbacks count within admin post columns.

function commentCount($type = 'comments'){

            if($type == 'trackbacks'):

                        $typeSql = 'comment_type = "trackback"';

                        $oneText = 'One :trackback';

                        $moreText = '% :trackbacks';

                        $noneText = 'No :trackbacks';

            elseif($type == 'pingbacks'):

                        $typeSql = 'comment_type = "pingback"';

                        $oneText = 'One :pingback';

                        $moreText = '% :pingbacks';

                        $noneText = 'No :pingbacks';

            endif;

            global $wpdb;

    $result = $wpdb->get_var('

        SELECT

            COUNT(comment_ID)

        FROM

            '.$wpdb->comments.'

        WHERE

            '.$typeSql.' AND

            comment_approved="1" AND

            comment_post_ID= '.get_the_ID()

    );

            if($result == 0):

                        echo str_replace('%', $result, $noneText);

            elseif($result == 1):

                        echo str_replace('%', $result, $oneText);

            elseif($result > 1):

                        echo str_replace('%', $result, $moreText);

            endif;

}

add_filter('manage_posts_columns', 'posts_columns_counts', 1);

add_action('manage_posts_custom_column', 'posts_custom_columns_counts', 1, 2);

function posts_columns_counts($defaults){

    $defaults['wps_post_counts'] = __('Counts');

    return $defaults;

}

function posts_custom_columns_counts($column_name, $id){

            if($column_name === 'wps_post_counts'){

                        commentCount('trackbacks'); echo "<br />";

                        commentCount('pingbacks');

          }

}

function commentCount($type = 'comments'){

if($type == 'trackbacks'):

$typeSql = 'comment_type = "trackback"';

$oneText = 'One :trackback';

$moreText = '% :trackbacks';

$noneText = 'No :trackbacks';

elseif($type == 'pingbacks'):

$typeSql = 'comment_type = "pingback"';

$oneText = 'One :pingback';

$moreText = '% :pingbacks';

$noneText = 'No :pingbacks';

endif;

global $wpdb;

$result = $wpdb->get_var('

SELECT

COUNT(comment_ID)

FROM

'.$wpdb->comments.'

WHERE

'.$typeSql.' AND

comment_approved="1" AND

comment_post_ID= '.get_the_ID()

);

if($result == 0):

echo str_replace('%', $result, $noneText);

elseif($result == 1):

echo str_replace('%', $result, $oneText);

elseif($result > 1):

echo str_replace('%', $result, $moreText);

endif;

}

add_filter('manage_posts_columns', 'posts_columns_counts', 1);

add_action('manage_posts_custom_column', 'posts_custom_columns_counts', 1, 2);

function posts_columns_counts($defaults){

$defaults['wps_post_counts'] = __('Counts');

return $defaults;

}

function posts_custom_columns_counts($column_name, $id){

if($column_name === 'wps_post_counts'){

commentCount('trackbacks'); echo "<br />";

commentCount('pingbacks');

}

Source: InstantShift

Easily embed and share Github gists

wp_embed_register_handler( 'gist', '/https:\/\/gist\.github\.com\/(\d+)(\?file=.*)?/i', 'wp_embed_handler_gist' );

function wp_embed_handler_gist( $matches, $attr, $url, $rawattr ) {

            $embed = sprintf(

                                    '<script src="https://gist.github.com/%1$s.js%2$s"></script>',

                                    esc_attr($matches[1]),

                                    esc_attr($matches[2])

                                    );

            return apply_filters( 'embed_gist', $embed, $matches, $attr, $url, $rawattr );

}

wp_embed_register_handler( 'gist', '/https:\/\/gist\.github\.com\/(\d+)(\?file=.*)?/i', 'wp_embed_handler_gist' );

function wp_embed_handler_gist( $matches, $attr, $url, $rawattr ) {

$embed = sprintf(

'<script src="https://gist.github.com/%1$s.js%2$s"></script>',

esc_attr($matches[1]),

esc_attr($matches[2])

);

return apply_filters( 'embed_gist', $embed, $matches, $attr, $url, $rawattr );

}

Source: Robert O’Rourke

Create a custom database error page

You often noticed the error “Error establishing a database connection.” Well the idea with this short code is to create a custom database error page. Copy and paste the code below in a new file name as db-error.php and save it on your wp-content directory and you are done.

<?php // custom WordPress database error page 

  header('HTTP/1.1 503 Service Temporarily Unavailable');

  header('Status: 503 Service Temporarily Unavailable');

  header('Retry-After: 600'); // 1 hour = 3600 seconds

  // If you wish to email yourself upon an error

  // mail("your@email.com", "Database Error", "There is a problem with the database!", "From: Db Error Watching");

?>

<!DOCTYPE HTML>

<html>

<head>

<title>Database Error</title>

<style>

body { padding: 20px; background: red; color: white; font-size: 60px; }

</style>

</head>

<body>

  You got problems.

</body>

</html>

<?php // custom WordPress database error page

header('HTTP/1.1 503 Service Temporarily Unavailable');

header('Status: 503 Service Temporarily Unavailable');

header('Retry-After: 600'); // 1 hour = 3600 seconds

// If you wish to email yourself upon an error

// mail("your@email.com", "Database Error", "There is a problem with the database!", "From: Db Error Watching");

<!DOCTYPE HTML>

<html>

<head>

<title>Database Error</title>

<style>

body { padding: 20px; background: red; color: white; font-size: 60px; }

</style>

</head>

<body>

You got problems.

</body>

</html>

Source: CSS Tricks

Add a “delete” button to WordPress admin bar

The following short code will let you add a “delete” button to WordPress admin bar. All you have to do is to copy and paste the code in your theme’s functions.php file.

<?php

function fb_add_admin_bar_trash_menu() {

  global $wp_admin_bar;

  if ( !is_super_admin() || !is_admin_bar_showing() )

      return;

  $current_object = get_queried_object();

  if ( empty($current_object) )

      return;

  if ( !empty( $current_object->post_type ) &&

     ( $post_type_object = get_post_type_object( $current_object->post_type ) ) &&

     current_user_can( $post_type_object->cap->edit_post, $current_object->ID )

  ) {

    $wp_admin_bar->add_menu(

        array( 'id' => 'delete',

            'title' => __('Move to Trash'),

            'href' => get_delete_post_link($current_object->term_id)

        )

    );

  }

}

add_action( 'admin_bar_menu', 'fb_add_admin_bar_trash_menu', 35 );

?>

<?php

function fb_add_admin_bar_trash_menu() {

global $wp_admin_bar;

if ( !is_super_admin() || !is_admin_bar_showing() )

return;

$current_object = get_queried_object();

if ( empty($current_object) )

return;

if ( !empty( $current_object->post_type ) &&

( $post_type_object = get_post_type_object( $current_object->post_type ) ) &&

current_user_can( $post_type_object->cap->edit_post, $current_object->ID )

) {

$wp_admin_bar->add_menu(

array( 'id' => 'delete',

'title' => __('Move to Trash'),

'href' => get_delete_post_link($current_object->term_id)

)

);

}

add_action( 'admin_bar_menu', 'fb_add_admin_bar_trash_menu', 35 );

Source: WPEngineer

Displaying RSS Feed

Adding the following code will let you display RSS feeds on your WordPress blog.

<?php

include_once(ABSPATH . WPINC . '/rss.php');

$feed = 'http://example.com/feed/';

$rss = fetch_feed($feed);

if (!is_wp_error( $rss ) ) :

    $maxitems = $rss->get_item_quantity(3);

    $rss_items = $rss->get_items(0, $maxitems);

    if ($rss_items):

        echo "<ul>\n";

        foreach ( $rss_items as $item ) :

            echo '<li>';

            echo '<a href="' . $item->get_permalink() . '">' . $item->get_title() . "</a>\n";

            echo '<p>' . $item->get_description() . "</li>\n";

        endforeach;

        echo "</ul>\n";

    endif;

endif;

?>

<?php

include_once(ABSPATH . WPINC . '/rss.php');

$feed = 'http://example.com/feed/';

$rss = fetch_feed($feed);

if (!is_wp_error( $rss ) ) :

$maxitems = $rss->get_item_quantity(3);

$rss_items = $rss->get_items(0, $maxitems);

if ($rss_items):

echo "<ul>\n";

foreach ( $rss_items as $item ) :

echo '<li>';

echo '<a href="' . $item->get_permalink() . '">' . $item->get_title() . "</a>\n";

echo '<p>' . $item->get_description() . "</li>\n";

endforeach;

echo "</ul>\n";

endif;

Source: Dan Gayle

Automatically create meta description from content

On pasting the following code into your functions.php file, it will let you create meta description from content automatically.

function create_meta_desc() {

    global $post;

if (!is_single()) { return; }

    $meta = strip_tags($post->post_content);

    $meta = strip_shortcodes($post->post_content);

    $meta = str_replace(array("\n", "\r", "\t"), ' ', $meta);

    $meta = substr($meta, 0, 125);

    echo "<meta name='description' content='$meta' />";

}

add_action('wp_head', 'create_meta_desc');

function create_meta_desc() {

global $post;

if (!is_single()) { return; }

$meta = strip_tags($post->post_content);

$meta = strip_shortcodes($post->post_content);

$meta = str_replace(array("\n", "\r", "\t"), ' ', $meta);

$meta = substr($meta, 0, 125);

echo "<meta name='description' content='$meta' />";

}

add_action('wp_head', 'create_meta_desc');

Source: Paul

Testing if a plugin is active or not

The following short code will let you track that whether the plugin is active or not.

<?php

   if (is_plugin_active('plugin-directory/plugin-file.php')) {

      // the plugin is active

   }

?>

<?php

if (is_plugin_active('plugin-directory/plugin-file.php')) {

// the plugin is active

}

Source: Cats Who Code

Change the “posts” label to “articles”

Open your functions.php file, paste the code and you will be able to change the “posts” label to “articles.”

add_filter('gettext',  'change_post_to_article');

add_filter('ngettext',  'change_post_to_article');

function change_post_to_article($translated) {

     $translated = str_ireplace('Post',  'Article',  $translated); 

     return $translated;

}

add_filter('gettext', 'change_post_to_article');

add_filter('ngettext', 'change_post_to_article');

function change_post_to_article($translated) {

$translated = str_ireplace('Post', 'Article', $translated);

return $translated;

}

Source: Smashing Magazine

WordPress pagination without plugins

Simply add the code to the place where you want to display your pagination and you are done.

global $wp_query;

$total = $wp_query->max_num_pages;

// only bother with the rest if we have more than 1 page!

if ( $total > 1 )  {

     // get the current page

     if ( !$current_page = get_query_var('paged') )

          $current_page = 1;

     // structure of "format" depends on whether we're using pretty permalinks

     $format = empty( get_option('permalink_structure') ) ? '&page=%#%' : 'page/%#%/';

     echo paginate_links(array(

          'base' => get_pagenum_link(1) . '%_%',

          'format' => $format,

          'current' => $current_page,

          'total' => $total,

          'mid_size' => 4,

          'type' => 'list'

     ));

}

global $wp_query;

$total = $wp_query->max_num_pages;

// only bother with the rest if we have more than 1 page!

if ( $total > 1 ) {

// get the current page

if ( !$current_page = get_query_var('paged') )

$current_page = 1;

// structure of "format" depends on whether we're using pretty permalinks

$format = empty( get_option('permalink_structure') ) ? '&page=%#%' : 'page/%#%/';

echo paginate_links(array(

'base' => get_pagenum_link(1) . '%_%',

'format' => $format,

'current' => $current_page,

'total' => $total,

'mid_size' => 4,

'type' => 'list'

));

}

Source: Smashing Magazine

Photo Credit: Flickr/mendhak

10 Essential WordPress Snippets

Adding Shortcuts to WordPress toolbar

Display pingbacks/trackbacks count within admin post columns

Easily embed and share Github gists

Create a custom database error page

Add a “delete” button to WordPress admin bar

Displaying RSS Feed

Automatically create meta description from content

Testing if a plugin is active or not

Change the “posts” label to “articles”

WordPress pagination without plugins

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