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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 |
---|---|
64 | $tabs = media_upload_tabs(); |
65 |
|
66 | if ( !empty($tabs) ) { |
67 | echo "<ul id='sidemenu'>\n"; |
68 | if ( isset($redir_tab) && array_key_exists($redir_tab, $tabs) ) |
69 | $current = $redir_tab; |
70 | elseif ( isset($_GET['tab']) && array_key_exists($_GET['tab'], $tabs) ) |
71 | $current = $_GET['tab']; |
72 | else |
73 | $current = apply_filters('media_upload_default_tab', 'type'); |
74 |
|
75 | foreach ( $tabs as $callback => $text ) { |
76 | $class = ''; |
77 | if ( $current == $callback ) |
78 | $class = " class='current'"; |
79 | $href = add_query_arg(array('tab'=>$callback, 's'=>false, 'paged'=>false, 'post_mime_type'=>false, 'm'=>false)); |
80 | $link = "<a href='" . esc_url($href) . "'$class>$text</a>"; |
81 | echo "\t<li id='" . esc_attr("tab-$callback") . "'>$link</li>\n"; |
82 | } |