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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 |
---|---|
1178 | $cachekey = '_oembed_' . md5( $url . serialize( $attr ) ); |
1179 | if ( $this->usecache ) { |
1180 | $cache = get_post_meta( $post_ID, $cachekey, true ); |
1181 |
|
1182 | // Failures are cached |
1183 | if ( '{{unknown}}' === $cache ) |
1184 | return $this->maybe_make_link( $url ); |
1185 |
|
1186 | if ( !empty($cache) ) |
1187 | return apply_filters( 'embed_oembed_html', $cache, $url, $attr ); |
1188 | } |
1189 |
|
1190 | // Use oEmbed to get the HTML |
1191 | $attr['discover'] = ( apply_filters('embed_oembed_discover', false) && author_can( $post_ID, 'unfiltered_html' ) ); |
1192 | $html = wp_oembed_get( $url, $attr ); |
1193 |
|
1194 | // Cache the result |
1195 | $cache = ( $html ) ? $html : '{{unknown}}'; |
1196 | update_post_meta( $post_ID, $cachekey, $cache ); |
1197 |
|
1198 | // If there was a result, return it |
1199 | if ( $html ) |
1200 | return apply_filters( 'embed_oembed_html', $html, $url, $attr ); |
1201 | } |
1202 |
|
1203 | // Still unknown |
1204 | return $this->maybe_make_link( $url ); |
1205 | } |
1206 |
|
1207 | /** |
1208 | * Delete all oEmbed caches. |
1209 | * |