Ticket #16734: category-template.php.diff

category-template.php

@@ -309 +309 @@
                 'name' => 'cat', 'id' => '',
                 'class' => 'postform', 'depth' => 0,
                 'tab_index' => 0, 'taxonomy' => 'category',
-                'hide_if_empty' => false
+                'hide_if_empty' => false, 'multiple' => false
         );
 
         $defaults['selected'] = ( is_category() ) ? get_query_var( 'cat' ) : 0;
@@ -335 +335 @@
 
         $categories = get_terms( $taxonomy, $r );
         $name = esc_attr( $name );
-        $class = esc_attr( $class );
         $id = $id ? esc_attr( $id ) : $name;
 
-        if ( ! $r['hide_if_empty'] || ! empty($categories) )
-                $output = "<select name='$name' id='$id' class='$class' $tab_index_attribute>\n";
+        if ( ! $r['hide_if_empty'] || ! empty($categories) ) {
+                if ( $r['multiple'] ) {
+                     $multiple = "multiple='true'";
+                     $class = 'postform multiple';
+                } else {
+                     $multiple = '';
+                     $class = esc_attr( $class );
+                }
+
+                $output = "<select name='$name' id='$id' class='$class' $tab_index_attribute $multiple>\n";
+        }
         else
                 $output = '';
 
@@ -948 +956 @@
 
                 $cat_name = apply_filters('list_cats', $category->name, $category);
                 $output .= "\t<option class=\"level-$depth\" value=\"".$category->term_id."\"";
-                if ( $category->term_id == $args['selected'] )
+                if ( in_array($category->term_id, (array) $args['selected'] ) )
                         $output .= ' selected="selected"';
                 $output .= '>';
                 $output .= $pad.$cat_name;