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Editorial Team
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Asked: 2026-06-06T07:29:47+00:00

I have some problems with header() function. It works and doesn’t work at the

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I have some problems with header() function. It works and doesn’t work at the same time.

The manual says:

Remember that header() must be called before any actual output is
sent, either by normal HTML tags, blank lines in a file, or from PHP.

Otherwise there will be an error.

But I can call header() anywhere in the html-script or php code after the output has been sent and header() works:

<?php
   echo "Output here";
   header("Location: http://stackoverflow.com");    // it works, it redirects to the site
   echo "And output here";
?>

Any header() works. This one header("Some-Header: bar-foo") can set header:

<!DOCTYPE html>
<html>
   <body>

     … some script here…

    <?php
      print_r(headers_list());      // only one header: [0] => X-Powered-By: PHP/5.3.5
      header("Some-Header: bar-foo")
      print_r(headers_list());      // two headers: [0] => X-Powered-By: PHP/5.3.5
                                                    [2] => Some-Header: bar-foo
      var_dump(headers_sent($file, $line)); // bool(false)
      var_dump($file); // string(0) ""
      var_dump($line); // int(0)
    ?>

     … some script here…

   </body>
</html>

How can it be? Is there something wrong with settings?

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1 Answer

  1. Editorial Team

    Chances are the php.ini has output_buffering enabled which is the exception to the rule. e.g.

    <?php

  ob_start();
  echo 'Foo';
  header('Location: http://www.google.com/');
  echo 'Bar';
  ob_end_flush();

    (Note: ob_start isn’t necessary in the script file if the ini has output_buffering enabled, but wanted to demonstrate the premise through code)

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