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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 |
|---|---|
| 55 | } else { |
| 56 | /** |
| 57 | * Filters the default media upload type in the legacy (pre-3.5.0) media popup. |
| 58 | * |
| 59 | * @since 2.5.0 |
| 60 | * |
| 61 | * @param string $type The default media upload type. Possible values include |
| 62 | * 'image', 'audio', 'video', 'file', etc. Default 'file'. |
| 63 | */ |
| 64 | $type = apply_filters( 'media_upload_default_type', 'file' ); |
| 65 | } |
| 66 | |
| 67 | // Tab: gallery, library, or type-specific. |
| 68 | if ( isset( $_GET['tab'] ) ) { |
| 69 | $tab = (string) $_GET['tab']; |
| 70 | } else { |
| 71 | /** |
| 72 | * Filters the default tab in the legacy (pre-3.5.0) media popup. |
| 73 | * |