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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 |
|---|---|
| 2666 | $tabs = array( |
| 2667 | // handler action suffix => tab label |
| 2668 | 'type' => '', |
| 2669 | 'type_url' => '', |
| 2670 | 'gallery' => '', |
| 2671 | 'library' => '', |
| 2672 | ); |
| 2673 | |
| 2674 | /** This filter is documented in wp-admin/includes/media.php */ |
| 2675 | $tabs = apply_filters( 'media_upload_tabs', $tabs ); |
| 2676 | unset( $tabs['type'], $tabs['type_url'], $tabs['gallery'], $tabs['library'] ); |
| 2677 | |
| 2678 | $props = array( |
| 2679 | 'link' => get_option( 'image_default_link_type' ), // db default is 'file' |
| 2680 | 'align' => get_option( 'image_default_align' ), // empty default |
| 2681 | 'size' => get_option( 'image_default_size' ), // empty default |
| 2682 | ); |
| 2683 | |
| 2684 | $exts = array_merge( wp_get_audio_extensions(), wp_get_video_extensions() ); |