This is a most common type of error's that once may get in PHP pages with header functions, lets see reasons that could cause this issues and how to fix it.
- Output Statements :
You might be having echo, printf output statements before the header that would cause this issue.
- Unwanted Blank Spaces :
There should be no blank lines or whitepaces spaces before or after the <php and ?> tags.
- File Format :
Make sure that the file format is UTF-8.
- Include files :
You might be having a include() to include a php page that may contain header redirects.
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