问在不刷新页面的情况下，使用PHP操作文件从HTML输入表单发布数据

EN

<form method="post" action="test.php">
    <span>
        Sign in System
    </span>
    <div data-validate = 
 "ID is required">
        <input id="uid" type="text" name="uid" 
 placeholder="Please enter your ID number">
        <span class="focus-input100"></span>
        <span class="symbol-input100">
            <i class="fa fa-lock" aria-hidden="true"></i>
        </span>
    </div>
                
    <input type="button" id="searchForm" 
onclick="SubmitForm();" value="Signin" />

<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
function SubmitForm() {
    var uid= $("#uid").val();
    $.post("test.php", { uid: uid},
        function(data) {
            alert("Sorry.. " + data);
        });
    }
</script>

session_start();
$uid = $_SESSION['uid'] = $_POST['uid'];
$first7 = substr($uid, 0, 8);
$ids=Array(Some Array Values)
foreach ($ids as $id) {
    if (substr($id, 0, 8) === $first7){
        header("Location: success.php");
    }
    else{ 
        echo "Entered ID is Wrong"; break;
    }
}