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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 |
|---|---|
| 5004 | |
| 5005 | /** |
| 5006 | * Filters an attachment ID found by URL. |
| 5007 | * |
| 5008 | * @since 4.2.0 |
| 5009 | * |
| 5010 | * @param int|null $post_id The post_id (if any) found by the function. |
| 5011 | * @param string $url The URL being looked up. |
| 5012 | */ |
| 5013 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
| 5014 | } |
| 5015 | |
| 5016 | /** |
| 5017 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
| 5018 | * |
| 5019 | * @since 4.0.0 |
| 5020 | * |
| 5021 | * @return string[] The relevant CSS file URLs. |
| 5022 | */ |