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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 |
---|---|
5302 |
|
5303 | /** |
5304 | * Filters an attachment ID found by URL. |
5305 | * |
5306 | * @since 4.2.0 |
5307 | * |
5308 | * @param int|null $post_id The post_id (if any) found by the function. |
5309 | * @param string $url The URL being looked up. |
5310 | */ |
5311 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
5312 | } |
5313 |
|
5314 | /** |
5315 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
5316 | * |
5317 | * @since 4.0.0 |
5318 | * |
5319 | * @return string[] The relevant CSS file URLs. |
5320 | */ |