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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 |
|---|---|
| 1179 | // See http://core.trac.wordpress.org/ticket/11311 |
| 1180 | $url = str_replace( '&', '&', $url ); |
| 1181 | |
| 1182 | // Look for known internal handlers |
| 1183 | ksort( $this->handlers ); |
| 1184 | foreach ( $this->handlers as $priority => $handlers ) { |
| 1185 | foreach ( $handlers as $id => $handler ) { |
| 1186 | if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) { |
| 1187 | if ( false !== $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ) ) |
| 1188 | return apply_filters( 'embed_handler_html', $return, $url, $attr ); |
| 1189 | } |
| 1190 | } |
| 1191 | } |
| 1192 | |
| 1193 | $post_ID = ( !empty($post->ID) ) ? $post->ID : null; |
| 1194 | if ( !empty($this->post_ID) ) // Potentially set by WP_Embed::cache_oembed() |
| 1195 | $post_ID = $this->post_ID; |
| 1196 | |
| 1197 | // Unknown URL format. Let oEmbed have a go. |