mint/app/install/install_head.php

<?php
    require_once "../path.php";
//error handler function
function customError($errno, $errstr)
 { 
 echo "<b>Error:</b> [$errno] $errstr";
 }

//set error handler
set_error_handler("customError");

    function user_db_is_exist(){
        $PDO = new PDO("sqlite:"._FILE_DB_USERINFO_, "", "");
        $PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
        $stmt = $PDO->query("SELECT count(*) as co FROM sqlite_master WHERE type=\"table\" AND name = \"user\"");
        
        $row = $stmt->fetch(PDO::FETCH_NUM);
        if ($row) {
            if($row[0]>0){
                return true;
            }
            else{
                return false;
            }
        } 
        else 
        {
            return false;
        }        
    }

    if(user_db_is_exist()){
        if(!isset($_COOKIE["userid"])){
            echo "请登陆后执行此操作";
            exit;
        }
    }
?>