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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 |
|---|---|
| 78 | |
| 79 | if ( !empty($tabs) ) { |
| 80 | echo "<ul id='sidemenu'>\n"; |
| 81 | if ( isset($redir_tab) && array_key_exists($redir_tab, $tabs) ) { |
| 82 | $current = $redir_tab; |
| 83 | } elseif ( isset($_GET['tab']) && array_key_exists($_GET['tab'], $tabs) ) { |
| 84 | $current = $_GET['tab']; |
| 85 | } else { |
| 86 | /** This filter is documented in wp-admin/media-upload.php */ |
| 87 | $current = apply_filters( 'media_upload_default_tab', $default ); |
| 88 | } |
| 89 | |
| 90 | foreach ( $tabs as $callback => $text ) { |
| 91 | $class = ''; |
| 92 | |
| 93 | if ( $current == $callback ) |
| 94 | $class = " class='current'"; |
| 95 | |
| 96 | $href = add_query_arg(array('tab' => $callback, 's' => false, 'paged' => false, 'post_mime_type' => false, 'm' => false)); |