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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 |
|---|---|
| 3995 | $tabs = array( |
| 3996 | // handler action suffix => tab label |
| 3997 | 'type' => '', |
| 3998 | 'type_url' => '', |
| 3999 | 'gallery' => '', |
| 4000 | 'library' => '', |
| 4001 | ); |
| 4002 | |
| 4003 | /** This filter is documented in wp-admin/includes/media.php */ |
| 4004 | $tabs = apply_filters( 'media_upload_tabs', $tabs ); |
| 4005 | unset( $tabs['type'], $tabs['type_url'], $tabs['gallery'], $tabs['library'] ); |
| 4006 | |
| 4007 | $props = array( |
| 4008 | 'link' => get_option( 'image_default_link_type' ), // DB default is 'file'. |
| 4009 | 'align' => get_option( 'image_default_align' ), // Empty default. |
| 4010 | 'size' => get_option( 'image_default_size' ), // Empty default. |
| 4011 | ); |
| 4012 | |
| 4013 | $exts = array_merge( wp_get_audio_extensions(), wp_get_video_extensions() ); |