双引号单引号不适用于PHP / JavaScript

Question

使用此代码时，我无法获得所需的结果

<?php 
session_start(); 
$returnMessage = "Hey"; 
$test = fopen('check.txt', a+);
fwrite($test, '
   if (empty($_SESSION["nabeel"])) {
     echo "<script>alert($returnMessage)</script>";
   };
    ?>    ')

我也试过这样做但确实有效......

<?php 
session_start(); 
$returnMessage = "Hey"; 
?>
$test = fopen('check.txt', a+);
fwrite($test, '
   if (empty($_SESSION["nabeel"])) {
     echo "<script>alert(<?php $returnMessage ?>)</script>";
   }
    ?>    ')

我认为引号有问题。

Answer 1

使用它：

<?php 
session_start(); 
$returnMessage = "Hey";
$test = fopen('check.txt', a+);
if (empty($_SESSION["nabeel"]))
    fwrite($test,'<script>alert('. $returnMessage .');</script>');
?>