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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 |
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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 | * |