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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 |
|---|---|
| 190 | wp_embed_register_handler( 'youtube_embed_url', '#https?://(www.)?youtube\.com/(?:v|embed)/([^/]+)#i', 'wp_embed_handler_youtube' ); |
| 191 | |
| 192 | /** |
| 193 | * Filters the audio embed handler callback. |
| 194 | * |
| 195 | * @since 3.6.0 |
| 196 | * |
| 197 | * @param callable $handler Audio embed handler callback function. |
| 198 | */ |
| 199 | wp_embed_register_handler( 'audio', '#^https?://.+?\.(' . join( '|', wp_get_audio_extensions() ) . ')$#i', apply_filters( 'wp_audio_embed_handler', 'wp_embed_handler_audio' ), 9999 ); |
| 200 | |
| 201 | /** |
| 202 | * Filters the video embed handler callback. |
| 203 | * |
| 204 | * @since 3.6.0 |
| 205 | * |
| 206 | * @param callable $handler Video embed handler callback function. |
| 207 | */ |
| 208 | wp_embed_register_handler( 'video', '#^https?://.+?\.(' . join( '|', wp_get_video_extensions() ) . ')$#i', apply_filters( 'wp_video_embed_handler', 'wp_embed_handler_video' ), 9999 ); |