Los code snippets son piezas reutilizables de código (HTML, CSS, JavaScript, etc) que se pueden insertar en una aplicación web con sólo un par de pulsaciones de teclas o hotkeys, lo cual facilita y agiliza el desarrollo de nuestra aplicación.
Hay veces en que queremos hacer algo que vimos en otras webs o blogs, o darle alguna funcionalidad extra al nuestro, es allí que podemos valernos de estos snippets o fragmentos de código re-utilizables.
Hasta podemos combinar el uso de estos para lograr una nueva funcionalidad para nuestro wordpress.
1. Increase the excerpt field height
add_action('admin_head', 'excerpt_textarea_height');
function excerpt_textarea_height() {
echo'
';
}
2. Dynamically create and attach sidebars to pages/posts
$dynamic_widget_areas = array(
/* rename or create new dynamic sidebars */
"Sidebar 01",
"Sidebar 02",
"Sidebar 03",
"Sidebar 04",
"Sidebar 05",
"Sidebar 06",
"Sidebar 07",
"Search Template",
);
if ( function_exists('register_sidebar') ) {
foreach ($dynamic_widget_areas as $widget_area_name) {
register_sidebar(array(
'name'=> $widget_area_name,
'before_widget' => '',
'before_title' => '',
'after_title' => '
',
));
}
}
add_action("admin_init", "sidebar_init");
add_action('save_post', 'save_sidebar_link');
function sidebar_init(){
add_meta_box("sidebar_meta", "Sidebar Selection", "sidebar_link", "page", "side", "default");
}
function sidebar_link(){
global $post, $dynamic_widget_areas;
$custom = get_post_custom($post->ID);
$link = $custom["_sidebar"][0];
?>
';
echo '';
echo '';
foreach ( $dynamic_widget_areas as $list ){
if($link == $list){
echo '';
}else{
echo '';
}
}
echo '
'; ?>
Select sidebar to use on this page.
ID;}
update_post_meta($post->ID, "_sidebar", $_POST["link"]);
}
add_action('admin_head', 'sidebar_css');
function sidebar_css()
{ echo'
';
}
3. Remove the screen options tab with screen_options hook
function remove_screen_options(){
return false;
}
add_filter('screen_options_show_screen', 'remove_screen_options');
4. Display related posts by posts current author
function get_related_author_posts() {
global $authordata, $post;
$authors_posts = get_posts( array( 'author' => $authordata->ID, 'post__not_in' => array( $post->ID ), 'posts_per_page' => 5 ) );
$output = '- ';
foreach ( $authors_posts as $authors_post ) {
$output .= '
- ' . apply_filters( 'the_title', $authors_post->post_title, $authors_post->ID ) . ' '; } $output .= '
5. Automatically add the Google +1 button
add_filter('the_content', 'google_plusone');
function google_plusone($content) {
$content = $content.'
6. Adjust settings on theme activation
add_action( 'after_setup_theme', 'the_theme_setup' );
function the_theme_setup() {
// First we check to see if our default theme settings have been applied.
$the_theme_status = get_option( 'theme_setup_status' );
// If the theme has not yet been used we want to run our default settings.
if ( $the_theme_status !== '1' ) {
// Setup Default WordPress settings
$core_settings = array(
'avatar_default' => 'mystery',
// Comment Avatars should be using mystery by default
'avatar_rating' => 'G',
// Avatar rating
'comment_max_links' => 0,
// We do not allow links from comments
'comments_per_page' => 20
// Default to 20 comments per page
);
foreach ( $core_settings as $k => $v ) {
update_option( $k, $v );
}
// Delete dummy post, page and comment.
wp_delete_post( 1, true );
wp_delete_post( 2, true );
wp_delete_comment( 1 );
update_option( 'theme_setup_status', '1' );
$msg = '
The ' . get_option( 'current_theme' ) . 'theme has changed your WordPress default settings and deleted default posts & comments.
';
add_action( 'admin_notices', $c = create_function( '', 'echo "' . addcslashes( $msg, '"' ) . '";' )
);
} elseif ( $the_theme_status === '1' and isset( $_GET['activated'] ) ) {
$msg = ' The ' . get_option( 'current_theme' ) . ' theme was successfully re-activated.
';
add_action( 'admin_notices', $c = create_function( '', 'echo "' . addcslashes( $msg, '"' ) . '";' )
);
}
}
7. Count total number of images in media library
function img_count(){
$query_img_args = array(
'post_type' => 'attachment',
'post_mime_type' =>array(
'jpg|jpeg|jpe' => 'image/jpeg',
'gif' => 'image/gif',
'png' => 'image/png',
),
'post_status' => 'inherit',
'posts_per_page' => -1,
);
$query_img = new WP_Query( $query_img_args );
echo $query_img->post_count; }
8. Display top 8 authors in wp_nav_menu using wp_list_authors
function wps_nav_authors($items, $args){
if( $args->theme_location == 'header-navigation' )
return $items . '9. Get feedburner count using get_transient and wp_remote_get
function feed_subscribers(){
$feed_url = 'http://feeds.feedburner.com/yourname';
$count = get_transient('feed_count');
if ($count != false) return $count;
$count = 0;
$data = wp_remote_get('http://feedburner.google.com/api/awareness/1.0/GetFeedData?uri='.$feed_url.'');
if (is_wp_error($data)) {
return 'error'; }else{
$body = wp_remote_retrieve_body($data);
$xml = new SimpleXMLElement($body);
$status = $xml->attributes();
if ($status == 'ok') {
$count = $xml->feed->entry->attributes()->circulation;
} else {
$count = 300; // fallback number }
}
set_transient('feed_count', $count, 60*60*24); // 24 hour cache
echo $count;
}
10. Changing the HTML editor font in wp 3.2
add_action( 'admin_head-post.php', 'devpress_fix_html_editor_font' );
add_action( 'admin_head-post-new.php', 'devpress_fix_html_editor_font' );
function devpress_fix_html_editor_font() { ?>
11. Restrict wp-admin access to subscribers
function restrict_access_admin_panel(){
global $current_user;
get_currentuserinfo();
if ($current_user->user_level < 4) {
wp_redirect( get_bloginfo('url') );
exit; }
}
add_action('admin_init', 'restrict_access_admin_panel', 1);
12. Add rel=”lightbox” to all images embedded in a post
add_filter('the_content', 'my_addlightboxrel'); function my_addlightboxrel($content) {
global $post;
$pattern ="//i";
$replacement = '';
$content = preg_replace($pattern, $replacement, $content);
return $content;
}
13. Change default “Enter title here” text within post title input field
function title_text_input( $title ){
return $title = 'Enter new title';
}
add_filter( 'enter_title_here', 'title_text_input'
);
14. Redirect commenter to thank you post or page
add_filter('comment_post_redirect', 'redirect_after_comment');
function redirect_after_comment(){
wp_redirect('/thank-you-page/');
exit();
}
15. Create most recent posts dashboard widget
function wps_recent_posts_dw() { ?>
16. Display hidden custom field _values
add_action( 'admin_head', 'showhiddencustomfields' );
function showhiddencustomfields() {
echo "\n";
}
17. Loading jQuery from the Google CDN with wp_register_script
add_action( 'init', 'jquery_register' );
function jquery_register() { if ( !is_admin() ) {
wp_deregister_script( 'jquery' );
wp_register_script( 'jquery', ( 'http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js' ), false, null, true );
wp_enqueue_script( 'jquery' ); }
}
