php - PHP echo JS 包含 PHP 变量

Question

我有 sendForm.php 文件，这是使用 PHPMailer 发送表单的 php。在标签之间有回声，我需要在标签之间使用 PHP 变量。这有可能吗？我知道将 PHP 和 JS 结合起来太过分了，但是我能做什么...我需要一个弹出窗口，这就是我也使用 JS 的原因。回声本身仅打印到网页本身。

$totalSize = ($totalSize/(1024*1024));
$totalSize = round($totalSize,2);

if(!$mail->Send()) {
   echo "Error sending form! You are trying to send too large files. Their size is: ", $totalSize, " MB";
   echo '<script type="text/javascript">alert("Error sending form! You are trying to send too large files. Their size is: ??? ");</script>';
   }

如何在 JS 中打印 $totalSize 变量来代替第二个回显中的那些问号？谢谢你的帮助。我还是个初学者。

Answer 1

PHP 是一种服务器端语言，而 JavaScript 是一种客户端语言。如果您尝试在服务器端验证表单而不重新加载页面（并让 JavaScript 弹出警告），请查看AJAX。

Answer 2

if(!$mail->Send()) {
   echo "Error sending form! You are trying to send too large files. Their size is: ". $totalSize. " MB";
   echo '<script type="text/javascript">alert("Error sending form! You are trying to send too large files. Their size is: '. $totalSize. '");</script>';
   }

//我更正了第一个回显中的一些错误（用点替换逗号）

Answer 3

尝试这个

  if(!$mail->Send()) {
    echo "Error sending form! You are trying to send too large files. Their size is: ".$totalSize." MB";
        ?>
<script type="text/javascript">
alert("Error sending form! You are trying to send too large files. Their size is: <?php echo $totalSize;?> ");
</script>
<?php }