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POCannot send session cookie - headers already sent
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/8028957/headers-already-sent-by-php">Headers already sent by PHP</a> </p> </blockquote> <p>Below is a simple example of my PHP code which (I hope so) is self explanatory. What I try to do is to update the session variable. But the output of the script is as follows:</p> <blockquote> <p>Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /Library/WebServer/Documents/facebook/test.php:8) in /Library/WebServer/Documents/facebook/test.php on line 11</p> </blockquote> <p>The warning is caused by the <code>echo</code> statements in line 8 and 9, of course. Is there any simple solution to stop this warning.</p> <p>Thanks for any pointers, Andrej</p> <pre><code>&lt;?php session_start(); $_SESSION['percent'] = 0; $iterations = 50; for ($i = 0; $i &lt;= iterations; $i++) { $percent = ($i / $iterations) * 100; echo "Hello World!"; echo "&lt;br /&gt;"; // update session variable session_start(); $_SESSION['percent'] = number_format($percent, 0, '', ''); session_commit(); } ?&gt; </code></pre> <p>The only solution that works (i.e. updates the session variable) for me is:</p> <pre><code>&lt;?php ob_start(); session_start(); $_SESSION['percent'] = 0; $iterations = 50; for ($i = 0; $i &lt;= 50; $i++) { $percent = ($i / $iterations) * 100; echo "Hello World!"; echo "&lt;br /&gt;"; // update session variable session_start(); $_SESSION['percent'] = number_format($percent, 0, '', ''); session_commit(); } ob_flush(); ?&gt; </code></pre> <p>It's ugly, while it buffers the output first...</p>
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