Warning: Cannot modify header information – headers already sent by

[codefewer]

Cannot modify header information, headers already sent by, ,

Why does it happen?

To understand why headers must be sent before output it’s necessary to look at a typical HTTPresponse. PHP scripts mainly generate HTML content, but also pass a set of HTTP/CGI headers to the webserver:

Cannot modify header information – headers already sent by

[rkieru]

Without a sample of the actual code where this error is occurring, it’s impossible to pinpoint the exact issue.

Generally-speaking though, this means that you are outputting something before the header declaration. A good example of this is a PHP script that has code for setting a cookie after the same script has already used echo to output information.

[Shikkediel]

I’m thinking he’s just dumping a link to his site and isn’t actually posing a question.

[Author]

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