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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 |
|---|---|
| 3774 | |
| 3775 | /** |
| 3776 | * Filters an attachment id found by URL. |
| 3777 | * |
| 3778 | * @since 4.2.0 |
| 3779 | * |
| 3780 | * @param int|null $post_id The post_id (if any) found by the function. |
| 3781 | * @param string $url The URL being looked up. |
| 3782 | */ |
| 3783 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
| 3784 | } |
| 3785 | |
| 3786 | /** |
| 3787 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
| 3788 | * |
| 3789 | * @since 4.0.0 |
| 3790 | * |
| 3791 | * @global string $wp_version |
| 3792 | * |