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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.
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2385 | function wp_get_audio_extensions() { |
2386 | /** |
2387 | * Filters the list of supported audio formats. |
2388 | * |
2389 | * @since 3.6.0 |
2390 | * |
2391 | * @param array $extensions An array of supported audio formats. Defaults are |
2392 | * 'mp3', 'ogg', 'flac', 'm4a', 'wav'. |
2393 | */ |
2394 | return apply_filters( 'wp_audio_extensions', array( 'mp3', 'ogg', 'flac', 'm4a', 'wav' ) ); |
2395 | } |
2396 |
|
2397 | /** |
2398 | * Returns useful keys to use to lookup data from an attachment's stored metadata. |
2399 | * |
2400 | * @since 3.9.0 |
2401 | * |
2402 | * @param WP_Post $attachment The current attachment, provided for context. |
2403 | * @param string $context Optional. The context. Accepts 'edit', 'display'. Default 'display'. |