Php Error Cannot Modify Header - Latest Information & Updates 2026

Web Reference: Warning: Cannot modify header information - headers already sent by (output started at /some/file.php:12) in /some/file.php on line 23. The lines mentioned in the error messages contain header() and setcookie() calls. What could be the reason for this? And how to fix it? Jan 16, 2026 · We’ll break down why this error happens, how to diagnose it, and step-by-step solutions to fix it—even for beginners. Jan 14, 2024 · This warning is triggered when your PHP script tries to send a header to the client after any output has been already sent. This tutorial provides a comprehensive walkthrough for fixing the ‘headers already sent’ warning in PHP.

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Last Updated: April 6, 2026

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