I’ve tried the same thing and was able to hook into the pre_option_ filter by using all as filter. add_filter(‘all’, ‘pre_option_’,1,3); function pre_option_($actionHook,$bool=false,$option_name) { if(strpos($actionHook,’pre_option_’) === FALSE){ return $bool; } }
If you look towards the end of the query process (which starts with the pre_get_posts filter), there is a filter called the_posts (not to be confused with the_post). This allows you to modify the output of get_posts completely, as you asked. Beware that this only works if there is no plugin or so that suppresses … Read more
There’s a few ways to do this, but I would argue that the preferred way is, in general, fetching the post_title attribute from the post object. This does not depend on removing all filters for a certain function and adding them back later — the latter requires you to directly access the global $wp_filter. get_post … Read more
If you look at the source code, you can see that wp_enqueue_style( ‘crayon’ ) is called in Crayon::enqueue_resources() which itself is called either from either Crayon::the_content() or Crayon::wp_head(). The code in Crayon::wp_head is: if (!CrayonGlobalSettings::val(CrayonSettings::EFFICIENT_ENQUEUE) || CrayonGlobalSettings::val(CrayonSettings::TAG_EDITOR_FRONT)) { CrayonLog::debug(‘head: force enqueue’); // Efficient enqueuing disabled, always load despite enqueuing or not in the_post self::enqueue_resources(); } … Read more
You’ll need to rely on the global post variable, or get_post(), which is essentially the same thing. add_filter( ‘the_content’, function( $content ) { $post = get_post(); if ( in_the_loop() && has_category( 123, $post ) ) { // etc. } return $content; } ); I included a check for in_the_loop(), because the the_content filter is commonly … Read more
Basically, you put the second block into the first. And wait until the last moment: add_action( ‘pre_get_posts’, ‘wpse_71899_start_filter’ ); function wpse_71899_start_filter() { // wrong page if ( ! is_page( ‘Home’ ) ) return; // stop here. add_filter(‘posts_orderby’, ‘edit_posts_orderby’); add_filter(‘posts_join_paged’,’edit_posts_join_paged’); } function edit_posts_join_paged($join_paged_statement) { global $wpdb; $join_paged_statement = “LEFT JOIN “.$wpdb->prefix.”wpv_voting ON “.$wpdb->prefix.”wpv_voting.post_id = $wpdb->posts.ID”; return … Read more
There are multiple was to find filters: Use an IDE (see Eclipse example), set WordPress as a separate project and search in this project for apply_filters or do_action. Get a program to search in all files of a directory (grep, Notepad++) and do the same search with that. Read the source code. If you start … Read more
Yes, it is possible. You can use the_content hook and assign your own filter to this hook. Then you should (that is the part when things get a little bit messy) parse and replace content of that post. So for example you can do it like so: function my_the_content_filter($content) { $content = str_replace(‘<h2 ‘, ‘<img … Read more
Correct. Action hooks do not return content, and honestly if you need an action hook to return content there is a pretty good chance that you are doing something wrong. However, if it turns out to be your only option the cleanest way to do it is with a static variable: function action_value_grab() { static … Read more
Filters should be returned even if your condition fails. You are currently just returning the output when your condition is met, not when it fails. return $string; at the end of each function should solve your issue. EXAMPLE add_filter(‘wpseo_canonical’, ‘listpagecanonical’); function listpagecanonical($string) { if (is_page(1)){ //I do my stuff here return ‘http://canonicalurl.com’ } return $string; … Read more