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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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4263 |
|
4264 | /** |
4265 | * Filters an attachment id found by URL. |
4266 | * |
4267 | * @since 4.2.0 |
4268 | * |
4269 | * @param int|null $post_id The post_id (if any) found by the function. |
4270 | * @param string $url The URL being looked up. |
4271 | */ |
4272 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
4273 | } |
4274 |
|
4275 | /** |
4276 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
4277 | * |
4278 | * @since 4.0.0 |
4279 | * |
4280 | * @return array The relevant CSS file URLs. |
4281 | */ |