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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 |
---|---|
3792 | /** |
3793 | * Fires when media is attached or detached from a post. |
3794 | * |
3795 | * @since 5.5.0 |
3796 | * |
3797 | * @param string $action Attach/detach action. Accepts 'attach' or 'detach'. |
3798 | * @param int $attachment_id The attachment ID. |
3799 | * @param int $parent_id Attachment parent ID. |
3800 | */ |
3801 | do_action( 'wp_media_attach_action', $action, $attachment_id, $parent_id ); |
3802 |
|
3803 | clean_attachment_cache( $attachment_id ); |
3804 | } |
3805 |
|
3806 | $location = 'upload.php'; |
3807 | $referer = wp_get_referer(); |
3808 |
|
3809 | if ( $referer ) { |
3810 | if ( false !== strpos( $referer, 'upload.php' ) ) { |