PHP 递归实现层级树状展现数据

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$arr['id'],

'fid' => $arr['fid'],

'name' => $arr['name'],

);

}

// 将数据按照缩进简单排列 见图1

function data2arr($tree, $rootId = 0, $level = 0) {

foreach($tree as $leaf) {

if($leaf['fid'] == $rootId) {

echo str_repeat(' ', $level) . $leaf['id'] . ' ' . $leaf['name'] . '

';

foreach($tree as $l) {

if($l['fid'] == $leaf['id']) {

data2arr($tree, $leaf['id'], $level + 1);

break;

}

}

}

}

}

data2arr($data);

echo '

-----------------------------------

';

// 将数据按照所属关系封装 见图2

function arr2tree($tree, $rootId = 0) {

$return = array();

foreach($tree as $leaf) {

if($leaf['fid'] == $rootId) {

foreach($tree as $subleaf) {

if($subleaf['fid'] == $leaf['id']) {

$leaf['children'] = arr2tree($tree, $leaf['id']);

break;

}

}

$return[] = $leaf;

}

}

return $return;

}

$tree = arr2tree($data);

print_r($tree);

echo '

-----------------------------------

';

// 将数据使用HTML再次展现 见图3

function tree2html($tree) {

echo '';

foreach($tree as $leaf) {

echo '

' .$leaf['name'];

if(! empty($leaf['children'])) tree2html($leaf['children']);

echo '';

}

echo '';

}

tree2html($tree);

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图 1：

?图 2：

??图 3：

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