Website Development

PHP Warning: Cannot modify header information

Posted on April 22, 2026, 4:14 pm • 399 Views

Posted on April 22, 2026, 4:14 pm

I am completely stuck. It works perfectly on my local XAMPP server but breaks when I upload it to production.

Replied on April 24, 2026, 9:44 am

Make sure you have absolutely no whitespace or HTML output before calling header(). Even a single space after a closing PHP tag can cause this error.

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