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Asked: 2026-05-11T12:44:14+00:00

Im working with PHP 4.3.11 and when I execute a header always responds with

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Im working with PHP 4.3.11 and when I execute a header always responds with an error like this

Warning: Cannot modify header information – headers already sent by (output started at d:\folder\file.php:1) in d:\folder\file.php on line 2

Warning: Cannot modify header information – headers already sent by (output started at d:\folder\file.php:1) in d:\folder\file.php on line 3 Current PHP version: 4.3.11

the code I used to generate this error was 

<?php     header('Cache-Control: no-cache, must-revalidate'); // HTTP/1.1     header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');   // Date in the past      echo 'Current PHP version: ' . phpversion();      // prints e.g. '2.0' or nothing if the extension isn't enabled     echo phpversion('tidy'); ?>

It has no spaces nor newlines before or after the php tags, and the same code in a 5.x version returns just the php version as expected.

Any clue?

Thanks in advance

Edit: Solved!: I’ve opened the file with western european encoding and deleted the BOM and it worked. Thanks all for your help!

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1 Answer

  1. Do you have a UTF BOM at the start of the file?

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