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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 |
|---|---|
| 66 | $tabs = media_upload_tabs(); |
| 67 | |
| 68 | if ( !empty($tabs) ) { |
| 69 | echo "<ul id='sidemenu'>\n"; |
| 70 | if ( isset($redir_tab) && array_key_exists($redir_tab, $tabs) ) |
| 71 | $current = $redir_tab; |
| 72 | elseif ( isset($_GET['tab']) && array_key_exists($_GET['tab'], $tabs) ) |
| 73 | $current = $_GET['tab']; |
| 74 | else |
| 75 | $current = apply_filters('media_upload_default_tab', 'type'); |
| 76 | |
| 77 | foreach ( $tabs as $callback => $text ) { |
| 78 | $class = ''; |
| 79 | if ( $current == $callback ) |
| 80 | $class = " class='current'"; |
| 81 | $href = add_query_arg(array('tab'=>$callback, 's'=>false, 'paged'=>false, 'post_mime_type'=>false, 'm'=>false)); |
| 82 | $link = "<a href='" . esc_url($href) . "'$class>$text</a>"; |
| 83 | echo "\t<li id='" . esc_attr("tab-$callback") . "'>$link</li>\n"; |
| 84 | } |