UPDATE查询在PDO中返回false

Question

我在UPDATE SQL中遇到问题，我知道在Google或堆栈溢出这里有很多答案，但是伙计们。帮帮我，我是新手，所以请放轻松。谢谢。

我正在使用最新版本的PHP，并且尝试了任何格式的UPDATE查询，但没有任何帮助。

我在这里遇到了一些问题，结果出在我的else语句中：

<?php

if(isset($_POST['m1_date'])) {
    $m2date = $_POST['m1_date'];
    $m2gpno = $_POST['m1_gpno'];
    $m2from = $_POST['m1_from'];
    $m2dest = $_POST['m1_destination'];
    $m2desc = $_POST['m1_desc'];
    $m2brnd = $_POST['m1_brand'];
    $m2partno = $_POST['m1_partno'];
    $m2sn = $_POST['m1_sn'];
    $m2qty = $_POST['m1_qty'];
    $m2um = $_POST['m1_um'];
    $m2prpse = $_POST['m1_purpose'];
    $m2rmrks = $_POST['m1_remarks'];

    $sql = 'UPDATE tbl_m1gpperm_trnsfer SET m1_date = :m2date, m1_gpno = :m2gpno, m1_from = :m2from, m1_destination = :m2dest, m1_desc = :m2desc, m1_brand = :m2brnd, m1_partno = :m2partno, m1_sn = :m2sn, m1_qty = :m2qty, m1_um = :m2um, m1_purpose = :m2prpse, m1_remarks = :m2rmrks';
    $stmt = $conn->prepare($sql);

    if($stmt->execute([':m2date' => $m2date, ':m2gpno' => $m2gpno, ':m2from' => $m2from, ':m2dest' => $m2dest, ':m2desc' => $m2desc, ':m2brnd' => $m2brnd, ':m2partno' => $m2partno, ':m2sn' => $m2sn, ':m2qty' => $m2qty, ':m2um' => $m2um, ':m2prpse' => $m2prpse, ':m2rmrks' => $m2rmrks])) {
        echo "Data has been Updated!";
        header("location:/aac_admin/M2.php");
    } else {
        echo "Error Update!";
        header("location:/aac_admin/M2.php");
    }
} else {
    echo "Error Data!";
}

这是“错误数据！”