A simple method to implement infinite classification tree list in PHP_PHP Tutorial

How to simply implement an infinite classification tree list in PHP

This article mainly introduces how to simply implement an infinite classification tree list in PHP, with an example analysis of how PHP implements trees through arrays The skills of tabulating tables have certain reference value. Friends in need can refer to it

The example in this article describes how to simply implement an infinite classification tree list in PHP. Share it with everyone for your reference. The details are as follows:

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$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'), 20 => array('id' => 20, 'pid' => 0, 'name' => '广东省'), 21 => array('id' => 21, 'pid' => 20, 'name' => '广州市'), ); $t = array(); foreach ($items as $id => $item) { if ($item['pid']) { $items[$item['pid']][$item['id']] = &$items[$item['id']]; $t[] = $id; } } foreach($t as $u) { unset($items[$u]); } echo " "; print_r($items);

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$items = array( 1 => array('id' => 1, 'pid' => 0, 'name' => 'Jiangxi Province'), 2 => array('id' => 2, 'pid' => 0, 'name' => 'Heilongjiang Province'), 3 => array('id' => 3, 'pid' => 1, 'name' => 'Nanchang City'), 4 => array('id' => 4, 'pid' => 2, 'name' => 'Harbin City'), 5 => array('id' => 5, 'pid' => 2, 'name' => 'Jixi City'), 6 => array('id' => 6, 'pid' => 4, 'name' => 'Xiangfang District'), 7 => array('id' => 7, 'pid' => 4, 'name' => 'Nangang District'), 8 => array('id' => 8, 'pid' => 6, 'name' => 'Hexing Road'), 9 => array('id' => 9, 'pid' => 7, 'name' => 'Xidazhi Street'), 10 => array('id' => 10, 'pid' => 8, 'name' => 'Northeast Forestry University'), 11 => array('id' => 11, 'pid' => 9, 'name' => 'Harbin Institute of Technology'), 12 => array('id' => 12, 'pid' => 8, 'name' => 'Harbin Normal University'), 13 => array('id' => 13, 'pid' => 1, 'name' => 'Ganzhou City'), 14 => array('id' => 14, 'pid' => 13, 'name' => 'Gan County'), 15 => array('id' => 15, 'pid' => 13, 'name' => 'Yudu County'), 16 => array('id' => 16, 'pid' => 14, 'name' => 'Maodian Town'), 17 => array('id' => 17, 'pid' => 14, 'name' => 'Dataan Township'), 18 => array('id' => 18, 'pid' => 16, 'name' => 'Yiyuan Village'), 19 => array('id' => 19, 'pid' => 16, 'name' => 'Shangba Village'), 20 => array('id' => 20, 'pid' => 0, 'name' => 'Guangdong Province'), 21 => array('id' => 21, 'pid' => 20, 'name' => 'Guangzhou City'), ); $t = array(); foreach ($items as $id => $item) { if ($item['pid']) { $items[$item['pid']][$item['id']] = &$items[$item['id']]; $t[] = $id; } } foreach($t as $u) { unset($items[$u]); } echo "

";
            print_r($items);
            
            

I hope this article will be helpful to everyone’s PHP programming design.

http://www.bkjia.com/PHPjc/975130.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/975130.htmlTechArticleHow to simply implement an infinite classification tree list in PHP This article mainly introduces how to simply implement an infinite classification tree list in PHP The method and example analysis of PHP's techniques of implementing tree lists through arrays...