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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 862 | $media_per_page = get_user_option('upload_per_page'); |
| 863 | if ( empty($media_per_page) ) |
| 864 | $media_per_page = 20; |
| 865 | $q['posts_per_page'] = $media_per_page; |
| 866 | $post_mime_types = array( // array( adj, noun ) |
| 867 | 'image' => array(__('Images'), __('Manage Images'), _n_noop('Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>')), |
| 868 | 'audio' => array(__('Audio'), __('Manage Audio'), _n_noop('Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>')), |
| 869 | 'video' => array(__('Video'), __('Manage Video'), _n_noop('Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>')), |
| 870 | ); |
| 871 | $post_mime_types = apply_filters('post_mime_types', $post_mime_types); |
| 872 | |
| 873 | $avail_post_mime_types = get_available_post_mime_types('attachment'); |
| 874 | |
| 875 | if ( isset($q['post_mime_type']) && !array_intersect( (array) $q['post_mime_type'], array_keys($post_mime_types) ) ) |
| 876 | unset($q['post_mime_type']); |
| 877 | |
| 878 | wp($q); |
| 879 | |
| 880 | return array($post_mime_types, $avail_post_mime_types); |