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POPHP Code suddenly stopped working
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/4261133/php-notice-undefined-variable-and-notice-undefined-index">PHP: “Notice: Undefined variable” and “Notice: Undefined index”</a> </p> </blockquote> <p>Had code that was working fine. Had to reboot the server and now it doesn't work.</p> <p>I have this at the start of the "landing" page (this is the page users get to after their password is validated)</p> <pre><code>&lt;?PHP session_start(); ?&gt; &lt;html&gt;&lt;head&gt; &lt;title&gt;Welcome&lt;/title&gt; &lt;/head&gt;&lt;body&gt; &lt;?PHP $_SESSION['valid']='TRUE'; ?&gt; ... code and HTML ... &lt;/body&gt;&lt;/html&gt; </code></pre> <p>When I do a print_r I get </p> <pre><code>"Array([valid] =&gt; TRUE)" </code></pre> <p>On all my subsequent pages I have </p> <pre><code>&lt;?PHP session_start(); ?&gt; &lt;html&gt; &lt;head&gt;&lt;title&gt;Page Title&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;?php /// Kick them out if they try to open this page directly if ($_SESSION['valid']!='TRUE') { session_destroy(); die("&lt;b&gt;You must be logged into this application to use it&lt;/b&gt;"); ?&gt; ... code and html ... &lt;/body&gt;&lt;/html&gt; </code></pre> <p>This was working fine before, but now I get:</p> <p>Notice: Undefined index: valid in C:\inetpub\wwwroot\usermanager\selectuser.php on line 9</p> <p>You must be logged into this application to use it.</p> <p>When I put a debugging statement in with print_r I just get "Array()" for the value of $_SESSION.</p> <p>Why isn't it working anymore?!? I've been tearing my hair out for four hours now trying to figure this out. NOTHING has changed in the code and it <em>was</em> working.</p>
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    1. USScott Thayer
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    1. COSo it was working before what? Did you upgrade PHP, change servers, modify temporary directories, or anything like that?
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    2. COHis code doesn't work because the valid variable hasn't been set yet, so PHP can't reference it.
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      1. USFelix Guo
    3. COChanging "TRUE" to TRUE didn't fix anything. Just as a test, I put in a string variable: $_SESSION['teststring'] = "hello world" and when I go to subsequent pages and try to "echo $_SESSION['teststring']; I get the Undefined index: teststring error
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      1. USScott Thayer
 

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