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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 |
|---|---|
| 209 | /** |
| 210 | * Filter whether to inspect the given URL for discoverable <link> tags. |
| 211 | * |
| 212 | * @since 2.9.0 |
| 213 | * |
| 214 | * @see WP_oEmbed::discover() |
| 215 | * |
| 216 | * @param bool false Whether to enable <link> tag discovery. Default false. |
| 217 | */ |
| 218 | $attr['discover'] = ( apply_filters( 'embed_oembed_discover', false ) && author_can( $post_ID, 'unfiltered_html' ) ); |
| 219 | |
| 220 | // Use oEmbed to get the HTML |
| 221 | $html = wp_oembed_get( $url, $attr ); |
| 222 | |
| 223 | // Cache the result |
| 224 | $cache = ( $html ) ? $html : '{{unknown}}'; |
| 225 | update_post_meta( $post_ID, $cachekey, $cache ); |
| 226 | |
| 227 | // If there was a result, return it |