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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 |
|---|---|
| 3813 | /** |
| 3814 | * Fires when media is attached or detached from a post. |
| 3815 | * |
| 3816 | * @since 5.5.0 |
| 3817 | * |
| 3818 | * @param string $action Attach/detach action. Accepts 'attach' or 'detach'. |
| 3819 | * @param int $attachment_id The attachment ID. |
| 3820 | * @param int $parent_id Attachment parent ID. |
| 3821 | */ |
| 3822 | do_action( 'wp_media_attach_action', $action, $attachment_id, $parent_id ); |
| 3823 | |
| 3824 | clean_attachment_cache( $attachment_id ); |
| 3825 | } |
| 3826 | |
| 3827 | $location = 'upload.php'; |
| 3828 | $referer = wp_get_referer(); |
| 3829 | |
| 3830 | if ( $referer ) { |
| 3831 | if ( false !== strpos( $referer, 'upload.php' ) ) { |