在PHP中上传图像文件时出错

Question

上传文件时遇到问题。 当我在目录中使用变量时， php制作一个重复的文件：一个在正确的目录中，另一个在变量前的目录中。 这是我写的代码

    $ext = $_POST["ext"];
    $evnm = $_POST["evnm"];
    $uploaddir = '../../../media/';
    if (!file_exists($uploaddir)) {
        mkdir($uploaddir, 0777, true);
    }
    $uploaddir .= $evnm.'/';
    if (!file_exists($uploaddir)) {
        mkdir($uploaddir, 0777, true);
    }
    $uploaddir .= $ext.'/';
    if (!file_exists($uploaddir)) {
        mkdir($uploaddir, 0777, true);
    }
    $fl = $_FILES["file"];
    foreach($fl["name"] as $key=>$name){
        $tmp_name = $fl["tmp_name"][$key];
        $targetFile = $uploaddir.$name;
        $files[] = $targetFile;
        if(!file_exists($targetFile)){
            if(move_uploaded_file($tmp_name, $targetFile)){
                $MSG = "Media file uploaded successfully<br>";
                $tst = true;
            }else{
                $MSG = "Media file failed uploding<br>";
                $tst = false;
            }
        }else{
            $MSG = 'Media file already exists<br>';
            $tst = false;
            $exst = true;
        }
    }

`