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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 |
|---|---|
| 179 | /** |
| 180 | * Filters whether to load the default embed handlers. |
| 181 | * |
| 182 | * Returning a falsey value will prevent loading the default embed handlers. |
| 183 | * |
| 184 | * @since 2.9.0 |
| 185 | * |
| 186 | * @param bool $maybe_load_embeds Whether to load the embeds library. Default true. |
| 187 | */ |
| 188 | if ( ! apply_filters( 'load_default_embeds', true ) ) { |
| 189 | return; |
| 190 | } |
| 191 | |
| 192 | wp_embed_register_handler( 'youtube_embed_url', '#https?://(www.)?youtube\.com/(?:v|embed)/([^/]+)#i', 'wp_embed_handler_youtube' ); |
| 193 | |
| 194 | /** |
| 195 | * Filters the audio embed handler callback. |
| 196 | * |
| 197 | * @since 3.6.0 |