PHP语句重定向到"else"不管用户输入

我试图使一个简单的登录脚本与煎饼工作。(网上发票)

无论你在表单中输入什么，它都会重定向到"else"语句。而不是尝试重定向到成功页面。

<?php
$con=mysqli_connect("example.com","example","example","example");
// Check connection
if (mysqli_connect_errno())
{
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($con, "SELECT * FROM mypanda_clients
                              WHERE unique_id='$_POST[username]'");
while ($row = mysqli_fetch_array($result))
{
    if ($_POST[password] == $ROW[passphrase])
    {
        header('Location: http://www.green-panda.com/my_panda/Clients/'.$_POST[username]); // concatenate the string
    }
    else
    {
        echo "The username and or password was incorrect. Please try again."; // missing semi colon
    }
}
?>