Changeset 3573 for trunk/wp-includes/functions.php

Timestamp:

02/28/2006 03:57:08 AM (19 years ago)

Author:

ryan

Message:

wp_dropdown_pages() and walk_page_tree()

File:

• trunk/wp-includes/functions.php (modified) (1 diff)

trunk/wp-includes/functions.php

@@ -744 +744 @@
         return $_page;
     }
+}
+
+function walk_page_tree($pages, $to_depth, $start_element_callback, $end_element_callback = '', $start_level_callback = '', $end_level_callback = '') {
+    $args = array_slice(func_get_args(), 6);
+    $parents = array();
+    $depth = 0;
+    $previous_page = '';
+    $output = '';
+
+    $last_page->post_parent = 0;
+    $last_page->post_id = 0;
+    $pages[] = $last_page;
+
+    foreach ( $pages as $page ) {
+        if ( !empty($previous_page) && ($page->post_parent == $previous_page->ID) ) {
+            // Previous page is my parent. Descend a level.
+            array_unshift($parents, $page);
+            $depth++;
+            if ( !$to_depth || ($depth < $to_depth) )
+                if ( !empty($start_level_callback) ) {
+                    $cb_args = array_merge( array($output, $depth), $args);
+                    $output = call_user_func_array($start_level_callback, $cb_args);
+                }
+        } else if ( $depth && ($page->post_parent == $parents[0]->ID) ) {
+            // On the same level as previous page.
+            if ( !$to_depth || ($depth < $to_depth) ) {
+                if ( !empty($end_element_callback) ) {
+                    $cb_args = array_merge( array($output, $previous_page, $depth), $args);
+                    $output = call_user_func_array($end_element_callback, $cb_args);
+                }
+            }
+        } else if ( $depth ) {
+            // Ascend one or more levels.
+            if ( !$to_depth || ($depth < $to_depth) ) {
+                if ( !empty($end_element_callback) ) {
+                    $cb_args = array_merge( array($output, $previous_page, $depth), $args);
+                    $output = call_user_func_array($end_element_callback, $cb_args);
+                }
+            }
+
+            while ( $parent = array_shift($parents)) {
+                $depth--;
+                if ( !$to_depth || ($depth < $to_depth) ) {
+                    if ( !empty($end_level_callback) ) {
+                        $cb_args = array_merge( array($output, $depth), $args);
+                        $output = call_user_func_array($end_level_callback, $cb_args);
+                    }
+                    if ( !empty($end_element_callback) ) {
+                        $cb_args = array_merge( array($output, $parent, $depth), $args);
+                        $output = call_user_func_array($end_element_callback, $cb_args);
+                    }
+                }
+                if ( $page->post_parent == $parent->ID ) {
+                    break;
+                }
+            }
+        } else if ( !empty($previous_page) ) {
+            // Close off previous page.
+            if ( !$to_depth || ($depth < $to_depth) ) {
+                if ( !empty($end_element_callback) ) {
+                    $cb_args = array_merge( array($output, $previous_page, $depth), $args);
+                    $output = call_user_func_array($end_element_callback, $cb_args);
+                }
+            }
+        }
+
+        // Start the page.
+        if ( !$to_depth || ($depth < $to_depth) ) {
+            if ( !empty($start_element_callback) && ($page->ID != 0) ) {
+                $cb_args = array_merge( array($output, $page, $depth), $args);
+                $output = call_user_func_array($start_element_callback, $cb_args);
+            }
+        }
+
+        $previous_page = $page;
+    }
+
+    return $output;
 }