Description:
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The last Set-Cookie header, setting a cookie by the same name, always overrides the data in the browser, but multiple set-cookie headers are send for the same name. This initially caused our proxy server to reject the response, because the header size exceeded the default limit.

setcookie() should override previous calls to the same cookie name. It should also issue an E_NOTICE message when overriding a previously called cookie, for easier tracing of problems where a cookie might wrongly be overridden.


Test script:
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<?php
setcookie('randomcookie','olddata');
setcookie('randomcookie','newdata');

Expected result:
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In the response headers as suggested:

Set-Cookie:randomcookie=newdata

Actual result:
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In the response headers as it is now:

Set-Cookie:randomcookie=olddata
Set-Cookie:randomcookie=newdata