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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 |
|---|---|
| 300 | |
| 301 | $post_types = get_post_types( array( 'show_ui' => true ) ); |
| 302 | /** |
| 303 | * Filters the array of post types to cache oEmbed results for. |
| 304 | * |
| 305 | * @since 2.9.0 |
| 306 | * |
| 307 | * @param array $post_types Array of post types to cache oEmbed results for. Defaults to post types with `show_ui` set to true. |
| 308 | */ |
| 309 | if ( empty( $post->ID ) || ! in_array( $post->post_type, apply_filters( 'embed_cache_oembed_types', $post_types ) ) ){ |
| 310 | return; |
| 311 | } |
| 312 | |
| 313 | // Trigger a caching |
| 314 | if ( ! empty( $post->post_content ) ) { |
| 315 | $this->post_ID = $post->ID; |
| 316 | $this->usecache = false; |
| 317 | |
| 318 | $content = $this->run_shortcode( $post->post_content ); |