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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 |
|---|---|
| 147 | // See http://core.trac.wordpress.org/ticket/11311 |
| 148 | $url = str_replace( '&', '&', $url ); |
| 149 | |
| 150 | // Look for known internal handlers |
| 151 | ksort( $this->handlers ); |
| 152 | foreach ( $this->handlers as $priority => $handlers ) { |
| 153 | foreach ( $handlers as $id => $handler ) { |
| 154 | if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) { |
| 155 | if ( false !== $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ) ) |
| 156 | return apply_filters( 'embed_handler_html', $return, $url, $attr ); |
| 157 | } |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | $post_ID = ( ! empty( $post->ID ) ) ? $post->ID : null; |
| 162 | if ( ! empty( $this->post_ID ) ) // Potentially set by WP_Embed::cache_oembed() |
| 163 | $post_ID = $this->post_ID; |
| 164 | |
| 165 | // Unknown URL format. Let oEmbed have a go. |