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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 |
|---|---|
| 103 | if ( isset($_GET['type']) ) |
| 104 | $type = strval($_GET['type']); |
| 105 | else |
| 106 | $type = apply_filters('media_upload_default_type', 'file'); |
| 107 | |
| 108 | // tab: gallery, library, or type-specific |
| 109 | if ( isset($_GET['tab']) ) |
| 110 | $tab = strval($_GET['tab']); |
| 111 | else |
| 112 | $tab = apply_filters('media_upload_default_tab', 'type'); |
| 113 | |
| 114 | $body_id = 'media-upload'; |
| 115 | |
| 116 | // let the action code decide how to handle the request |
| 117 | if ( $tab == 'type' || $tab == 'type_url' ) |
| 118 | do_action("media_upload_$type"); |
| 119 | else |
| 120 | do_action("media_upload_$tab"); |
| 121 | } |