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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 |
|---|---|
| 129 | if ( isset($_GET['type']) ) |
| 130 | $type = strval($_GET['type']); |
| 131 | else |
| 132 | $type = apply_filters('media_upload_default_type', 'file'); |
| 133 | |
| 134 | // tab: gallery, library, or type-specific |
| 135 | if ( isset($_GET['tab']) ) |
| 136 | $tab = strval($_GET['tab']); |
| 137 | else |
| 138 | $tab = apply_filters('media_upload_default_tab', 'type'); |
| 139 | |
| 140 | $body_id = 'media-upload'; |
| 141 | |
| 142 | // let the action code decide how to handle the request |
| 143 | if ( $tab == 'type' || $tab == 'type_url' || ! array_key_exists( $tab , media_upload_tabs() ) ) |
| 144 | do_action("media_upload_$type"); |
| 145 | else |
| 146 | do_action("media_upload_$tab"); |
| 147 | } |