php文件上传服务器后为什么会被一行输出?报错

没什么好描述的，php文件本地（Windows OS）测试正常上传到服务器(Linux OS)报错，然后下载下来，打开格式变成一行输出了！

AJAX到add.php,以下是add.php 

<?php 

if(isset($_POST['address'],$_POST['emailPwd'],$_POST['quota'])){ require_once('api/cPanel.php'); //打开cPanel.php一行输出 

require_once('config/config.php'); //打开config.php正常 

$address=$_POST['address']; 

$emailPwd=$_POST['emailPwd']; 

$quota=$_POST['quota']; 

//实例化对象

$emailAccount1=new emailAccount($host1, $username1, $password1, $port = 2082, $ssl = false, $theme = 'x3', $address); $create=$emailAccount1->create($emailPwd,$quota); echo $create; 

} ?>

以下是错误截图：