Home >Backend Development >PHP Tutorial >PHP handles parent-child level selection problem
/**
* @param $data 操作的数组
* @param string $fieldPri 唯一键名，如果是表则是表的主键
* @param string $fieldPid 父ID键名
* @param int $pid 一级PID的值
* @param string $sid 子ID用于获得指定指ID的所有父ID
* @param int $type 操作方式1=>返回多维数组,2=>返回一维数组,3=>得到指定子ID(参数$sid)的所有父
* @param string $html 名称前缀，用于在视图中显示层次感的列表
* @param int $level 不需要传参数（执行时调用）
* @return array
*/
private function channel($data, $fieldPri = 'cid', $fieldPid = 'pid', $pid = 0, $sid = null, $type = 2, $html = " ", $level = 1)
{
if (!$data) {
return array();
}
switch ($type) {
case 1:
$arr = array();
foreach ($data as $v) {
if ($v[$fieldPid] == $pid) {
$arr[$v[$fieldPri]] = $v;
$arr[$v[$fieldPri]]['html'] = str_repeat($html, $level - 1);
$arr[$v[$fieldPri]]["Data"] = self::channel($data, $fieldPri, $fieldPid, $v[$fieldPri], $sid, $type, $html, $level + 1);
}
}
return $arr;
case 2:
$arr = array();
$id = 0;
foreach ($data as $v) {
if ($v[$fieldPid] == $pid) {
$arr[$id] = $v;
$arr[$id]['level'] = $level;
$arr[$id]['html'] = str_repeat($html, $level - 1);
$sArr = self::channel($data, $fieldPri, $fieldPid, $v[$fieldPri], $sid, $type, $html, $level + 1);
$arr = array_merge($arr, $sArr);
$id = count($arr);
}
}
return $arr;
case 3:
static $arr = array();
foreach ($data as $v) {
if ($v[$fieldPri] == $sid) {
$arr[] = $v;
$sArr = self::channel($data, $fieldPri, $fieldPid, $pid, $v[$fieldPid], $type, $html, $level + 1);
$arr = array_merge($arr, $sArr);
}
}
return $arr;
}
}
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The above has introduced the issue of parent-child level selection in PHP, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.