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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 1189 | $cachekey = '_oembed_' . md5( $url . serialize( $attr ) ); |
| 1190 | if ( $this->usecache ) { |
| 1191 | $cache = get_post_meta( $post_ID, $cachekey, true ); |
| 1192 | |
| 1193 | // Failures are cached |
| 1194 | if ( '{{unknown}}' === $cache ) |
| 1195 | return $this->maybe_make_link( $url ); |
| 1196 | |
| 1197 | if ( !empty($cache) ) |
| 1198 | return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_ID ); |
| 1199 | } |
| 1200 | |
| 1201 | // Use oEmbed to get the HTML |
| 1202 | $attr['discover'] = ( apply_filters('embed_oembed_discover', false) && author_can( $post_ID, 'unfiltered_html' ) ); |
| 1203 | $html = wp_oembed_get( $url, $attr ); |
| 1204 | |
| 1205 | // Cache the result |
| 1206 | $cache = ( $html ) ? $html : '{{unknown}}'; |
| 1207 | update_post_meta( $post_ID, $cachekey, $cache ); |
| 1208 | |
| 1209 | // If there was a result, return it |
| 1210 | if ( $html ) |
| 1211 | return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_ID ); |
| 1212 | } |
| 1213 | |
| 1214 | // Still unknown |
| 1215 | return $this->maybe_make_link( $url ); |
| 1216 | } |
| 1217 | |
| 1218 | /** |
| 1219 | * Delete all oEmbed caches. |
| 1220 | * |