如果数组是一个元素，则变量不会发布

Question

此脚本转到一个文件（insert.php），该文件获取字符串元素（它们是ID），然后将其插入到另一个表中。如果我的数组不止一个元素，那么它可以完美工作。如果只是一个元素，它将不会发布到插入页面？ finalArr是整数数组。

$("#wooform").submit(function() {

    var myJSON = JSON.stringify(finalArr);            

    $.ajax({
        type: "POST",
        url: "https://hidden.com/hidden_dashboard/model/insert.php",
        data: "array=" + myJSON,
        success: function(data) {
            alert("sucess");
        }
    });
});

Insert.php

<?php
    session_start();
    include('pathto/dbclass/databaseClass.php');
    $databaseClass = new databaseClass();
    $randomid = rand();


    $conn = $databaseClass->connect();
    $jsondata = $_POST['array'];

    $_SESSION['randomid'] = $randomid;

    $sql = "INSERT INTO ajax_test (jsondata, randomid)
    VALUES ('$jsondata', $randomid)";

    if ($conn->query($sql) != TRUE) {
        echo "Error";
    } 



    ?>

调用jquery的表单：

    <form class="cart" action="https://hidden.com/product/fdd" method="post" enctype='multipart/form-data'
    style="position: fixed; top: 120px;" id="wooform">

            <div class="quantity">
        <label class="screen-reader-text" for="quantity_5b7db721bf3ae">Quantity</label>
        <input
            type="hidden"
            id="quantity_5b7db721bf3ae"
            class="input-text qty text"
            step="1"
            min="0"
            max=""
            name="quantity"
            value="0"
            title="Qty"
            size="4"
            pattern="[0-9]*"
            inputmode="numeric"
            aria-labelledby="" /><center><p>Total: $<a id="clicks">0.00</a><span> Plus Tax</span><br>
<img height='50' width='50' src='hidden/2018/08/paypalicon2.png'> 
             <img height='50' width='50' src='hidden/2018/08/amazonicon.png'>
             <img height='50' width='50' src='hidden/2018/08/applepayicon2.png'>
             <img style="visibility: hidden" height='50' width='50' src='/hidden/2018/08/applepayicon2.png'>

            </p></center><center><button style="border-radius: 5px;
    background-color: orange;
    color: white;" type="submit" name="add-to-cart" value="2444" class="single_add_to_cart_button button alt">Checkout</button></center>
    </div>