语法错误意外'？' 在当地工作[关闭]

问题描述：

i have this code in the top of my index.php. And it works perfect when i run it locally with mamp. But when i go live with the page and upload it to the hosting service and launch the website i get this error in the log. And the site does not load.

PHP Parse error: syntax error, unexpected '?' in /home/*****/*****.*****.**/index.php on line 3

<?php
session_start();
$AccountsucessRegister = $_SESSION['Accountsucess'] ?? '';
$AccountfailRegister  = $_SESSION['Accountfail'] ?? '';
unset($_SESSION['Accountsucess']);
unset($_SESSION['Accountfail']);
?>
 <?php if ($AccountsucessRegister !== ''): ?>
 <?php echo "<script>alert('$AccountsucessRegister');</script>" ?>
 <?php endif; ?>
 <?php if ($AccountfailRegister !== ''): ?>
 <?php echo "<script>alert('$AccountfailRegister');</script>" ?>
 <?php endif; ?>

我的代码位于index.php的顶部。当我在mamp本地运行它时，它的工作非常完美。但是，当我上传页面并将其上传到托管服务并启动网站时，我在日志中收到此错误。并且该网站无法加载。 p>

PHP解析错误：语法错误，意外'？' 在第3行的 /home/*****/*****.*****.**/index.php p> blockquote>

  ＆lt;？php 
session_start（）; 
 $ AccountsucessRegister = $ _SESSION ['Accountsucess'] ??  ''; 
 $ AccountfailRegister = $ _SESSION ['Accountfail'] ??  ''; 
unset（$ _ SESSION ['Accountsucess']）; 
unset（$ _ SESSION ['Accountfail']）; 
？＆gt; 
＆lt;？php if（$ AccountsucessRegister！==''）:?  ＆gt; 
＆lt;？php echo“＆lt; script＆gt; alert（'$ AccountsucessRegister'）;＆lt; / script＆gt;”  ？＆gt; 
＆lt;？php endif;  ？＆gt; 
＆lt;？php if（$ AccountfailRegister！==''）：？＆gt; 
＆lt;？php echo“＆lt; script＆gt; alert（'$ AccountfailRegister'）;＆lt; / script＆gt;”  ？＆gt; 
＆lt;？php endif;  ？＆gt; 
  code>  pre> 
  div>

答

Maybe you have on local php7+ version and at your provider not.

Among provider have .ini file option to change the php version on shared hosting but if not the error comes from

$AccountsucessRegister = $_SESSION['Accountsucess'] ?? '';

must be

$AccountsucessRegister = isset($_SESSION['Accountsucess']) ? $_SESSION['Accountsucess'] : '';

语法错误意外'？' 在当地工作[关闭]

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