PHP echo JS包含PHP變量

Question

我有sendForm.php文件，這是使用PHPMailer發送表單的php。 在標簽之間有回聲，我需要在標簽之間使用PHP變量。 這有可能嗎？ 我知道這太結合了PHP和JS，但是我能做什么......我需要一個窗口彈出窗口，這也是我使用JS的原因。 echo本身只打印到網頁本身。

$totalSize = ($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內部打印$ totalSize變量代替第二個回聲中的那些問號呢？ 謝謝你的幫助。 我還是個初學者。

Answer 1

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>';
   }

//我糾正了第一個echo中的一些錯誤（用點替換逗號）

Answer 2

PHP是服務器端語言 ，而JavaScript是客戶端語言 。 如果您嘗試在服務器端驗證表單而不重新加載頁面（並讓JavaScript彈出警告），請查看AJAX 。

Answer 3

嘗試這個

  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 }