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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 |
|---|---|
| 121 | |
| 122 | /** |
| 123 | * Filters the determined post ID. |
| 124 | * |
| 125 | * @since 4.4.0 |
| 126 | * |
| 127 | * @param int $post_id The post ID. |
| 128 | * @param string $url The requested URL. |
| 129 | */ |
| 130 | $post_id = apply_filters( 'oembed_request_post_id', $post_id, $request['url'] ); |
| 131 | |
| 132 | $data = get_oembed_response_data( $post_id, $request['maxwidth'] ); |
| 133 | |
| 134 | if ( ! $data ) { |
| 135 | return new WP_Error( 'oembed_invalid_url', get_status_header_desc( 404 ), array( 'status' => 404 ) ); |
| 136 | } |
| 137 | |
| 138 | return $data; |
| 139 | } |