php手册学习 文件上传

if(!empty($userfile)){
$userfile = $_FILES["userfile"];
$type_arr = array("jpeg", "jpg", "png", "gif");
var_dump($userfile);
$dir = "./upload";
if(!is_dir($dir)){
    mkdir($dir);
}

for($i=0; $i<count($userfile["name"]); $i++){
    $type=explode("/", $userfile["type"][$i]);    
    $filename = $dir."/".date('YmdHis',time()).mt_rand().".".$type[1];
    
    if($userfile["error"][$i] == UPLOAD_ERR_OK){
        if($userfile["tmp_name"][$i] != ""){
            if(in_array($type[1], $type_arr)){
                if(move_uploaded_file($userfile["tmp_name"][$i], $filename)){
                    echo $userfile["name"][$i]."上传成功"."<br/>";
                }else{
                    echo $userfile["name"][$i]."上传失败";
                }             
            }
        }        
    }


}
    
}