Case, When doing recursive infinite subclasses, in the foreach loop, the static variables will be accumulated for each cycle. If you need each cycle to be a category If so, you need to destroy the static variables every time you loop (Recommended learning: PHP Programming from Beginner to Master)
/**
* 获取所有下级
* $data 用户数组
* $pid 用户user_id
* $level 递归层次
* $bool_level 判断是否分级(不分级则获取所有的下级)
* $clear 是否销毁静态变量
*/
public function getTree($data, $pid = 0, $level = 0, $bool_level = true ,$clear=false ) {
if ($pid < 1) {
return false;
}
static $arr = [];
if($clear){
$arr = null;
static $arr = [];
}
if ($bool_level) {
$level = $level - 1;
} else {
$level = 1;
}
if ($level >= 0) {
foreach ($data as $key => $val) {
if ($val['pid'] == $pid) {
$arr[$level + 1][] = $val['id'];
$this->getTree($data, $val['id'], $level, $bool_level);
}
}
}
return $arr;
}The above is the detailed content of When are php static variables destroyed?. For more information, please follow other related articles on the PHP Chinese website!
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