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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 |
|---|---|
| 5417 | * boolean false. For information about casting to booleans see the |
| 5418 | * {@link https://www.php.net/manual/en/language.types.boolean.php PHP documentation}. |
| 5419 | * Use the === operator for testing the post ID when developing filters using |
| 5420 | * this hook. |
| 5421 | * |
| 5422 | * @param int|null $post_id The result of the post ID lookup. Null to indicate |
| 5423 | * no lookup has been attempted. Default null. |
| 5424 | * @param string $url The URL being looked up. |
| 5425 | */ |
| 5426 | $post_id = apply_filters( 'pre_attachment_url_to_postid', null, $url ); |
| 5427 | if ( null !== $post_id ) { |
| 5428 | return (int) $post_id; |
| 5429 | } |
| 5430 | |
| 5431 | $dir = wp_get_upload_dir(); |
| 5432 | $path = $url; |
| 5433 | |
| 5434 | $site_url = parse_url( $dir['url'] ); |
| 5435 | $image_path = parse_url( $path ); |