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Warning session start - cannot send session cache limiter - headers already sent

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How to resolve or fix Warning session start - cannot send session cache limiter - headers already sent,Problem in php, this question many time ask by my student to me.

Know what the mean of Warning session start - cannot send session cache limiter - headers already sent.

This error message mean some data already send by server to to browser before start session so now browser can’t start more session.

What’s the mistake in your php source code when you write the code you are giving blank space before session start you need to delete white space before session start to resolve this problem you should delete unnecessary space from your source code file.