formattree 无限分类

formattree.php

<?php
/*
 * Format Tree
 **/
class FORMATTREE
{
	function formatTree($arr,$child_key='id',$parent_key='parent_id') {
		$tree = array();
		foreach ($arr as $val) {
			if ( isset($arr[$val[$parent_key]]) ) {
				$arr[$val[$parent_key]]['son'][] = &$arr[$val[$child_key]];
			} else {
				$tree[] = &$arr[$val[$child_key]];
			}
		}
		return $tree;
	}


}