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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 |
|---|---|
| 3760 | |
| 3761 | /** |
| 3762 | * Filter an attachment id found by URL. |
| 3763 | * |
| 3764 | * @since 4.2.0 |
| 3765 | * |
| 3766 | * @param int|null $post_id The post_id (if any) found by the function. |
| 3767 | * @param string $url The URL being looked up. |
| 3768 | */ |
| 3769 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
| 3770 | } |
| 3771 | |
| 3772 | /** |
| 3773 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
| 3774 | * |
| 3775 | * @since 4.0.0 |
| 3776 | * |
| 3777 | * @global string $wp_version |
| 3778 | * |