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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 |
|---|---|
| 3724 | |
| 3725 | /** |
| 3726 | * Filter an attachment id found by URL. |
| 3727 | * |
| 3728 | * @since 4.2.0 |
| 3729 | * |
| 3730 | * @param int|null $post_id The post_id (if any) found by the function. |
| 3731 | * @param string $url The URL being looked up. |
| 3732 | */ |
| 3733 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
| 3734 | } |
| 3735 | |
| 3736 | /** |
| 3737 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
| 3738 | * |
| 3739 | * @since 4.0.0 |
| 3740 | * |
| 3741 | * @global string $wp_version |
| 3742 | * |