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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 |
|---|---|
| 208 | /** |
| 209 | * Filter the oEmbed URL to be fetched. |
| 210 | * |
| 211 | * @since 2.9.0 |
| 212 | * |
| 213 | * @param string $provider URL of the oEmbed provider. |
| 214 | * @param string $url URL of the content to be embedded. |
| 215 | * @param array $args Optional arguments, usually passed from a shortcode. |
| 216 | */ |
| 217 | $provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args ); |
| 218 | |
| 219 | foreach( array( 'json', 'xml' ) as $format ) { |
| 220 | $result = $this->_fetch_with_format( $provider, $format ); |
| 221 | if ( is_wp_error( $result ) && 'not-implemented' == $result->get_error_code() ) |
| 222 | continue; |
| 223 | return ( $result && ! is_wp_error( $result ) ) ? $result : false; |
| 224 | } |
| 225 | return false; |
| 226 | } |