filters - Read For Learn

What to use instead of the content_save_pre filter?

What Adam Brown’s site says is that the hook no longer appears in 3.8. I greped a 3.9 and found: bash-4.2# grep -Rni ‘content_save_pre’ * wp-includes/kses.php:1327: * The wp_filter_post_kses() function is added to the ‘content_save_pre’, wp-includes/kses.php:1344: add_filter(‘content_save_pre’, ‘wp_filter_post_kses’); wp-includes/kses.php:1370: remove_filter(‘content_save_pre’, ‘wp_filter_post_kses’); wp-includes/default-filters.php:89:foreach ( array( ‘content_save_pre’, ‘excerpt_save_pre’, ‘comment_save_pre’, ‘pre_comment_content’ ) as $filter ) { Interestingly the … Read more

Change “You are now logged out” text

This allows for the message to be overwritten specifically for the loggedout message while leaving all other messages alone. Here is more documentation on the filter. add_filter( ‘wp_login_errors’, ‘my_logout_message’ ); function my_logout_message( $errors ){ if ( isset( $errors->errors[‘loggedout’] ) ){ $errors->errors[‘loggedout’][0] = ‘This is the <strong style=”color:red;”>logged out</strong> message.’; } return $errors; }

How to change Woocommerce breadcrumbs content?

That is due to the fact, that your filter woocommerce_breadcrumb doesn’t even exist. This filter here works and pulls out all the elements, that are currently in the breadcrumb (as an array): add_filter( ‘woocommerce_get_breadcrumb’, ‘change_breadcrumb’ ); function change_breadcrumb( $crumbs ) { var_dump( $crumbs ); return $crumbs; } And this filter pulls out the main term … Read more

How to add attribute to output with wp_video_shortcode add_filter

I get Undefined variable: for $video, $post_id and $library and the video’s in the page are blank. Replace: add_filter( ‘wp_video_shortcode’, ‘my_video_shortcode’, 10, 2 ); with: add_filter( ‘wp_video_shortcode’, ‘my_video_shortcode’, 10, 5 ); to access all five input arguments in your filter’s callback. ps: my_ is such a common prefix, that I would consider something more unique. … Read more

Call to undefined function error after adding add_filter to wp-config

There is a section that should look like this: defined( ‘ABSPATH’ ) || define( ‘ABSPATH’, __DIR__ . “https://wordpress.stackexchange.com/” ); require_once( ABSPATH . ‘wp-settings.php’ ); add_filter() is available after that, you are probably using it too early.

Add wrapper to only youtube videos via embed_oembed_html filter function

$url will contain the full URL to the embed source. E.g.: https://www.youtube.com/watch?v=_UmOY6ek_Y4, so you have to search within $url to see if the provider’s name appears: add_filter( ’embed_oembed_html’, ‘wpse_embed_oembed_html’, 99, 4 ); function wpse_embed_oembed_html( $cache, $url, $attr, $post_ID ) { $classes = array(); // Add these classes to all embeds. $classes_all = array( ‘responsive-container’, ); … Read more

How to use the_excerpt in a filter hook?

use the filter get_the_excerpt. Look at line no. 250 here, they are using the_excerpt internally on the function get_the_excerpt(), and in this function on line no. 272, they’re applying the filter get_the_excerpt on the actual excerpt. Hence, add_filter(‘get_the_excerpt’, ‘exc’); function exc($param) { return “Whew !”.$param; } is the way to go if you want to … Read more

How to make post and comment count unclickable with dashboard_glance_items hook

The dashboard_glance_items filter is only useful for modifying the extra elements. The posts/comments data elements have already been displayed. Here are three ideas: Method #1 – Use the dashboard_glance_items filter: You can use the following filter setup, to remove the posts/pages/comments elements from the output of wp_dashboard_right_now(). The trick is simple, foul WordPress to think … Read more

What effect does the_content filter have on performance?

The difference would be negligible. The the_content filter is fired regardless of whether you use it or not because WordPress uses it for other things. So the only thing that would be performance related would be the complexity of your filter function. But since you’d probably be doing the same level of complexity in a … Read more

Overriding wp_get_archives() apply_filters()

A WordPress filter is a function that takes in a string, array, or object, does something to it, and returns that filtered string, array, or object. So what you want to do is turn “WHERE post_type=”post” AND post_status=”publish”” into “WHERE post_type=”post” OR post_type=”events” AND post_status=”publish””. That is fairly straightforward. From the looks of things, the … Read more

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