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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 |
|---|---|
| 4544 | $tabs = array( |
| 4545 | // handler action suffix => tab label |
| 4546 | 'type' => '', |
| 4547 | 'type_url' => '', |
| 4548 | 'gallery' => '', |
| 4549 | 'library' => '', |
| 4550 | ); |
| 4551 | |
| 4552 | /** This filter is documented in wp-admin/includes/media.php */ |
| 4553 | $tabs = apply_filters( 'media_upload_tabs', $tabs ); |
| 4554 | unset( $tabs['type'], $tabs['type_url'], $tabs['gallery'], $tabs['library'] ); |
| 4555 | |
| 4556 | $props = array( |
| 4557 | 'link' => get_option( 'image_default_link_type' ), // DB default is 'file'. |
| 4558 | 'align' => get_option( 'image_default_align' ), // Empty default. |
| 4559 | 'size' => get_option( 'image_default_size' ), // Empty default. |
| 4560 | ); |
| 4561 | |
| 4562 | $exts = array_merge( wp_get_audio_extensions(), wp_get_video_extensions() ); |