php - 处理两个 $_POST 时出现警告 : array_merge(): Argument #1 is not an array,

Question

我在处理 $_POST['cpl'] 时收到以下错误警告:array_merge(): Argument #1 is not an array，尽管 $_POST['add'] 工作正常

if (is_array($_POST['add'])) {
    foreach ($_POST['add'] as $key => $value) $_POST['add'][$key] = mysql_real_escape_string($value);
    $en = array_merge($en, $_POST['add']);
}

if (is_array($_POST['cpl'])) {
    foreach ($_POST['cpl'] as $key => $value) $_POST['cpl'][$key] = mysql_real_escape_string($value);
    $cp = '';
    $cp = array_merge($cp, $_POST['cpl']);
}

Answer 1

那是因为 $cp 是一个字符串(您明确地以这种方式定义了它)。

$cp = ''; // <-- empty string
$cp = array_merge($cp, $_POST['cpl']);

应该是:

$cp = array(); // <--now it's an array
$cp = array_merge($cp, $_POST['cpl']);