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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 |
|---|---|
| 4899 | |
| 4900 | /** |
| 4901 | * Filters an attachment ID found by URL. |
| 4902 | * |
| 4903 | * @since 4.2.0 |
| 4904 | * |
| 4905 | * @param int|null $post_id The post_id (if any) found by the function. |
| 4906 | * @param string $url The URL being looked up. |
| 4907 | */ |
| 4908 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
| 4909 | } |
| 4910 | |
| 4911 | /** |
| 4912 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
| 4913 | * |
| 4914 | * @since 4.0.0 |
| 4915 | * |
| 4916 | * @return string[] The relevant CSS file URLs. |
| 4917 | */ |