上的index.php未定义的变量 | php未定义的变量

本文介绍了上的index.php未定义的变量的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我一直在调试一个PHP的网站，实现在页面标题navsection的顶部和侧面导航栏标题sidenavcat导航栏。在运行时我navsection显示的是：

The following corresponding lines in header.php are as follows

<li <?php echo ($navsection == 'hospitality') ? ' class="current"' : ''; ?> >
   <a href="http://localhost/NOALivingWebsite/code/hospitality.php">Hospitality</a>
</li>
<li <?php echo ($navsection == 'sustainability') ? ' class="current"' : ''; ?> >
   <a href="http://localhost/NOALivingWebsite/code/sustainability.php">Sustainability</a>
</li>
<li <?php echo ($navsection == 'events') ? ' class="current"' : ''; ?> >
   <a href="http://localhost/NOALivingWebsite/code/events.php">Events</a>
</li>
<li <?php echo ($navsection == 'press') ? ' class="current"' : ''; ?> >
   <a href="http://localhost/NOALivingWebsite/code/press.php">Press</a>
</li>
<li <?php echo ($navsection == 'catalogue') ? ' class="current"' : ''; ?> >
   <a href="http://localhost/NOALivingWebsite/code/catalogue.php">Catalogues</a>
</li>
<li <?php echo ($navsection == 'retail') ? ' class="current"' : ''; ?> >
   <a href="http://localhost/NOALivingWebsite/code/locations.php">Locations</a>
</li>
<li <?php echo ($navsection == 'register') ? ' class="current"' : ''; ?> >
   <a href="http://localhost/NOALivingWebsite/index.php">Shop Online</a>
</li>

Any advice you may lend will be greatly appreciate. Thank you for your time

解决方案

The error message is rather than straight-forward. At the time where your ternary operator is executed, the variable $navsection is not defined.A possible solution is to define that variable as Session variable and access it like that:

$_SESSION["navsection"]

So your code will look like that:

<li <?php echo ($_SESSION["navsection"] == 'register') ? ' class="current"' : ''; ?> >
   <a href="http://localhost/NOALivingWebsite/index.php">Shop Online</a>
</li>

Note: Make sure that your session variable navsection is defined before the above check, possibly in another .php file.

You will need to use this one as well in your html file. This should be used at the top of your html file like that:

<?php
  session_start( );
  $_SESSION["navsection"] = "register"; // Temporary fix.
?>
<html>
.
.
.

So that you can access your session variable.

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