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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 |
---|---|
120 |
|
121 | /** |
122 | * Filters the determined post ID. |
123 | * |
124 | * @since 4.4.0 |
125 | * |
126 | * @param int $post_id The post ID. |
127 | * @param string $url The requested URL. |
128 | */ |
129 | $post_id = apply_filters( 'oembed_request_post_id', $post_id, $request['url'] ); |
130 |
|
131 | $data = get_oembed_response_data( $post_id, $request['maxwidth'] ); |
132 |
|
133 | if ( ! $data ) { |
134 | return new WP_Error( 'oembed_invalid_url', get_status_header_desc( 404 ), array( 'status' => 404 ) ); |
135 | } |
136 |
|
137 | return $data; |
138 | } |