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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 | } |