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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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5130 |
|
5131 | /** |
5132 | * Filters an attachment ID found by URL. |
5133 | * |
5134 | * @since 4.2.0 |
5135 | * |
5136 | * @param int|null $post_id The post_id (if any) found by the function. |
5137 | * @param string $url The URL being looked up. |
5138 | */ |
5139 | return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url ); |
5140 | } |
5141 |
|
5142 | /** |
5143 | * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view. |
5144 | * |
5145 | * @since 4.0.0 |
5146 | * |
5147 | * @return string[] The relevant CSS file URLs. |
5148 | */ |