Fix Cannot modify header information - headers already sent by output
{SOLVED} session_start(): Cannot start session when headers already sent in
PHP Tutorial 2017 - Cannot modify header information FIX
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Last Updated: August 16, 2026
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![session_start() [function.session-start]: Cannot send session cookie - headers already sent...](https://i.ytimg.com/vi/lw8foYo-Fuk/mqdefault.jpg)
![[SOLVED] Warning: session_start(): Cannot start session when headers already sent: 000webhost.com](https://i.ytimg.com/vi/aMtGlxD4yYk/mqdefault.jpg)
![[SOLVE] Warning: session_start(): Cannot start session when headers already sent: 000webhost.com](https://i.ytimg.com/vi/aqUVG9Rxpwc/mqdefault.jpg)
