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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 |
|---|---|
| 22 | if ( isset($_GET['type']) ) |
| 23 | $type = strval($_GET['type']); |
| 24 | else |
| 25 | $type = apply_filters('media_upload_default_type', 'file'); |
| 26 | |
| 27 | // tab: gallery, library, or type-specific |
| 28 | if ( isset($_GET['tab']) ) |
| 29 | $tab = strval($_GET['tab']); |
| 30 | else |
| 31 | $tab = apply_filters('media_upload_default_tab', 'type'); |
| 32 | |
| 33 | $body_id = 'media-upload'; |
| 34 | |
| 35 | // let the action code decide how to handle the request |
| 36 | if ( $tab == 'type' ) |
| 37 | do_action("media_upload_$type"); |
| 38 | else |
| 39 | do_action("media_upload_$tab"); |
| 40 | |