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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 |
|---|---|
| 3934 | |
| 3935 | /** |
| 3936 | * Filters an attachment id found by URL. |
| 3937 | * |
| 3938 | * @since 4.2.0 |
| 3939 | * |
| 3940 | * @param int|null $post_id The post_id (if any) found by the function. |
| 3941 | * @param string $url The URL being looked up. |
| 3942 | */ |
| 3943 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
| 3944 | } |
| 3945 | |
| 3946 | /** |
| 3947 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
| 3948 | * |
| 3949 | * @since 4.0.0 |
| 3950 | * |
| 3951 | * @return array The relevant CSS file URLs. |
| 3952 | */ |