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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 |
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4741 |
|
4742 | /** |
4743 | * Filters an attachment ID found by URL. |
4744 | * |
4745 | * @since 4.2.0 |
4746 | * |
4747 | * @param int|null $post_id The post_id (if any) found by the function. |
4748 | * @param string $url The URL being looked up. |
4749 | */ |
4750 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
4751 | } |
4752 |
|
4753 | /** |
4754 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
4755 | * |
4756 | * @since 4.0.0 |
4757 | * |
4758 | * @return string[] The relevant CSS file URLs. |
4759 | */ |