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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?
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图 1：
?图 2：
??图 3：
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