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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 |
|---|---|
| 169 | $cachekey = '_oembed_' . md5( $url . serialize( $attr ) ); |
| 170 | if ( $this->usecache ) { |
| 171 | $cache = get_post_meta( $post_ID, $cachekey, true ); |
| 172 | |
| 173 | // Failures are cached |
| 174 | if ( '{{unknown}}' === $cache ) |
| 175 | return $this->maybe_make_link( $url ); |
| 176 | |
| 177 | if ( ! empty( $cache ) ) |
| 178 | return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_ID ); |
| 179 | } |
| 180 | |
| 181 | // Use oEmbed to get the HTML |
| 182 | $attr['discover'] = ( apply_filters('embed_oembed_discover', false) && author_can( $post_ID, 'unfiltered_html' ) ); |
| 183 | $html = wp_oembed_get( $url, $attr ); |
| 184 | |
| 185 | // Cache the result |
| 186 | $cache = ( $html ) ? $html : '{{unknown}}'; |
| 187 | update_post_meta( $post_ID, $cachekey, $cache ); |
| 188 | |
| 189 | // If there was a result, return it |
| 190 | if ( $html ) |
| 191 | return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_ID ); |
| 192 | } |
| 193 | |
| 194 | // Still unknown |
| 195 | return $this->maybe_make_link( $url ); |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Delete all oEmbed caches. |
| 200 | * |