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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 |
|---|---|
| 1089 | $cachekey = '_oembed_' . md5( $url . serialize( $attr ) ); |
| 1090 | if ( $this->usecache ) { |
| 1091 | $cache = get_post_meta( $post_ID, $cachekey, true ); |
| 1092 | |
| 1093 | // Failures are cached |
| 1094 | if ( '{{unknown}}' === $cache ) |
| 1095 | return $this->maybe_make_link( $url ); |
| 1096 | |
| 1097 | if ( !empty($cache) ) |
| 1098 | return apply_filters( 'embed_oembed_html', $cache, $url, $attr ); |
| 1099 | } |
| 1100 | |
| 1101 | // Use oEmbed to get the HTML |
| 1102 | $attr['discover'] = ( apply_filters('embed_oembed_discover', false) && author_can( $post_ID, 'unfiltered_html' ) ) ? true : false; |
| 1103 | $html = wp_oembed_get( $url, $attr ); |
| 1104 | |
| 1105 | // Cache the result |
| 1106 | $cache = ( $html ) ? $html : '{{unknown}}'; |
| 1107 | update_post_meta( $post_ID, $cachekey, $cache ); |
| 1108 | |
| 1109 | // If there was a result, return it |
| 1110 | if ( $html ) |
| 1111 | return apply_filters( 'embed_oembed_html', $html, $url, $attr ); |
| 1112 | } |
| 1113 | |
| 1114 | // Still unknown |
| 1115 | return $this->maybe_make_link( $url ); |
| 1116 | } |
| 1117 | |
| 1118 | /** |
| 1119 | * Delete all oEmbed caches. |
| 1120 | * |