• 不用递归实现无限分类数据的树形格式化


         function genTree5($items) {
    	    foreach ($items as $item)
    	        $items[$item['pid']]['son'][$item['id']] = &$items[$item['id']];
    	    return isset($items[0]['son']) ? $items[0]['son'] : array();
    	} 
    

    9行代码的

        function genTree9($items) {
    	    $tree = array(); //格式化好的树
    	    foreach ($items as $item)
    	        if (isset($items[$item['pid']]))
    	            $items[$item['pid']]['son'][] = &$items[$item['id']];
    	        else
    	            $tree[] = &$items[$item['id']];
    	    return $tree;
        }
    

     先取数据后格式化输出

    取出的数组格式如下:

        $items = array(
    	    1 => array('id' => 1, 'pid' => 0, 'name' => '江西省'),
    	    2 => array('id' => 2, 'pid' => 0, 'name' => '黑龙江省'),
    	    3 => array('id' => 3, 'pid' => 1, 'name' => '南昌市'),
    	    4 => array('id' => 4, 'pid' => 2, 'name' => '哈尔滨市'),
    	    5 => array('id' => 5, 'pid' => 2, 'name' => '鸡西市'),
    	    6 => array('id' => 6, 'pid' => 4, 'name' => '香坊区'),
    	    7 => array('id' => 7, 'pid' => 4, 'name' => '南岗区'),
    	    8 => array('id' => 8, 'pid' => 6, 'name' => '和兴路'),
    	    9 => array('id' => 9, 'pid' => 7, 'name' => '西大直街'),
    	    10 => array('id' => 10, 'pid' => 8, 'name' => '东北林业大学'),
    	    11 => array('id' => 11, 'pid' => 9, 'name' => '哈尔滨工业大学'),
    	    12 => array('id' => 12, 'pid' => 8, 'name' => '哈尔滨师范大学'),
    	    13 => array('id' => 13, 'pid' => 1, 'name' => '赣州市'),
    	    14 => array('id' => 14, 'pid' => 13, 'name' => '赣县'),
    	    15 => array('id' => 15, 'pid' => 13, 'name' => '于都县'),
    	    16 => array('id' => 16, 'pid' => 14, 'name' => '茅店镇'),
    	    17 => array('id' => 17, 'pid' => 14, 'name' => '大田乡'),
    	    18 => array('id' => 18, 'pid' => 16, 'name' => '义源村'),
    	    19 => array('id' => 19, 'pid' => 16, 'name' => '上坝村'),
    	);
    

    from:www.oschina.net/code/snippet_173183_11767

    二叉树表设计方式

    http://www.phpro.org/tutorials/Managing-Hierarchical-Data-with-PHP-and-MySQL.html

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  • 原文地址:https://www.cnblogs.com/darktime/p/3296341.html
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