"TypeError: implode(): Argument #2 ($array) must be of type ?array, string given" in PHP 8

Question

<div class="form-group col-md-8" id="my" style="display: none;">
    <label>Choose Vpn Server</label>
    <div class="row">
        <?php
            $sqlUrl4 = "SELECT * FROM vpn_networks";
            $result4 = myQuery($sqlUrl4);

            while ($row4 = myFetchArray($result4)) {
        ?>
        <div class="col-sm-4 text-center">
            <label>
                <input type="checkbox" name="vpn_network[]" value="<?php echo $row4['id'];?>" id="iptv" />
                <?php echo $row4['title'];?>
            </label>
        </div>
        <?php
                    }
                ?>
    </div>
</div>

$vpn1 =implode(',', $_POST['vpn_network']?? '');

错误：

Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must
be of type ?array, string given in
C:\xampp\htdocs\ideology\partnerprocess.php:22 Stack trace: #0
C:\xampp\htdocs\ideology\partnerprocess.php(22): implode(',', '') #1
{main} thrown in C:\xampp\htdocs\ideology\partnerprocess.php on line
22

Answer 1

$_POST['vpn_network'] ?? '' 表示该值可以是您提交的数组或字符串。 $_POST['vpn_network'] ?? [].

更有意义

您真的不应该相信表单中提交的值。检查你的每一个假设。如果你期望一个数组而不是检查它是否是一个数组。

$vpn_network = isset($_POST['vpn_network']) && is_array($_POST['vpn_network']) ? $_POST['vpn_network'] : [];
$vpn1 =implode(',', $vpn_network);

您也可以使用 filter extension。它提供了许多过滤器，可以验证来自表单的数据。

Answer 2

implode() 函数第二个参数必须是数组。已弃用第二个参数中的非数组。

详情请查看： https://www.php.net/manual/en/migration74.deprecated.php

"TypeError: implode(): Argument #2 ($array) must be of type ?array, string given" in PHP 8

"TypeError: implode(): Argument #2 ($array) must be of type ?array, string given" in PHP 8

php

php-8