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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 |
|---|---|
| 3797 | /** |
| 3798 | * Fires when media is attached or detached from a post. |
| 3799 | * |
| 3800 | * @since 5.5.0 |
| 3801 | * |
| 3802 | * @param string $action Attach/detach action. Accepts 'attach' or 'detach'. |
| 3803 | * @param int $attachment_id The attachment ID. |
| 3804 | * @param int $parent_id Attachment parent ID. |
| 3805 | */ |
| 3806 | do_action( 'wp_media_attach_action', $action, $attachment_id, $parent_id ); |
| 3807 | |
| 3808 | clean_attachment_cache( $attachment_id ); |
| 3809 | } |
| 3810 | |
| 3811 | $location = 'upload.php'; |
| 3812 | $referer = wp_get_referer(); |
| 3813 | |
| 3814 | if ( $referer ) { |
| 3815 | if ( false !== strpos( $referer, 'upload.php' ) ) { |