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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 |
|---|---|
| 2219 | /** |
| 2220 | * Filter whether to load the default embed handlers. |
| 2221 | * |
| 2222 | * Returning a falsey value will prevent loading the default embed handlers. |
| 2223 | * |
| 2224 | * @since 2.9.0 |
| 2225 | * |
| 2226 | * @param bool $maybe_load_embeds Whether to load the embeds library. Default true. |
| 2227 | */ |
| 2228 | if ( ! apply_filters( 'load_default_embeds', true ) ) { |
| 2229 | return; |
| 2230 | } |
| 2231 | |
| 2232 | wp_embed_register_handler( 'youtube_embed_url', '#https?://(www.)?youtube\.com/embed/([^/]+)#i', 'wp_embed_handler_youtube' ); |
| 2233 | |
| 2234 | wp_embed_register_handler( 'googlevideo', '#http://video\.google\.([A-Za-z.]{2,5})/videoplay\?docid=([\d-]+)(.*?)#i', 'wp_embed_handler_googlevideo' ); |
| 2235 | |
| 2236 | /** |
| 2237 | * Filter the audio embed handler callback. |