When are php static variables destroyed?-PHP Problem-php.cn

When are php static variables destroyed?

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Release： 2023-02-24 19:34:01

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When are php static variables destroyed?

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[&#39;pid&#39;] == $pid) {
                    $arr[$level + 1][] = $val[&#39;id&#39;];
                    $this->getTree($data, $val[&#39;id&#39;], $level, $bool_level);
                }
            }
        }
        
        return $arr;
        
    }

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