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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 |
|---|---|
| 1367 | * Checks to make sure that the embeds library hasn't already been loaded. If |
| 1368 | * it hasn't, then it will load the embeds library. |
| 1369 | * |
| 1370 | * @since 2.9.0 |
| 1371 | */ |
| 1372 | function wp_maybe_load_embeds() { |
| 1373 | if ( ! apply_filters( 'load_default_embeds', true ) ) |
| 1374 | return; |
| 1375 | wp_embed_register_handler( 'googlevideo', '#http://video\.google\.([A-Za-z.]{2,5})/videoplay\?docid=([\d-]+)(.*?)#i', 'wp_embed_handler_googlevideo' ); |
| 1376 | wp_embed_register_handler( 'audio', '#^https?://.+?\.(' . join( '|', wp_get_audio_extensions() ) . ')$#i', apply_filters( 'wp_audio_embed_handler', 'wp_embed_handler_audio' ), 9999 ); |
| 1377 | wp_embed_register_handler( 'video', '#^https?://.+?\.(' . join( '|', wp_get_video_extensions() ) . ')$#i', apply_filters( 'wp_video_embed_handler', 'wp_embed_handler_video' ), 9999 ); |
| 1378 | } |
| 1379 | |
| 1380 | /** |
| 1381 | * The Google Video embed handler callback. Google Video does not support oEmbed. |
| 1382 | * |
| 1383 | * @see WP_Embed::register_handler() |
| 1384 | * @see WP_Embed::shortcode() |
| 1385 | * |