Description:
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setcookie() will happily produce expires times with years greater than 4 digits in length. This violates various RFC's and can also lead to unexpectedly hung scripts (especially on 64-bit).

Reproduce code:
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This works fine on 32-bit, but will keep the script looping effectively forever formatting the date as GMT on 64-bit.

setcookie('test', 'testing', PHP_INT_MAX);

Sample patch: http://evilcode.net/sjg/php5.2.6-setcookie-head.c.patch

This may not be the right place for this, as there are probably other violators as well. A more general/generic fix may be in order.

Expected result:
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Date output should be trimmed to the end of year 9999, possibly a warning presented.