PHP Error Log "referer"

From: Date: Fri, 03 Oct 2014 13:26:22 +0000
Subject: PHP Error Log "referer"
Groups: php.install 
Request: Send a blank email to php-install+get-20359@lists.php.net to get a copy of this message
Hello, I just performed a well overdue PHP upgrade from 5.3.2 to 5.5.17 and I noticed something new in the error logs.. Following a stack trace I see the following: ", referer: {url}" Does anyone have information about when this was introduced or if it can be disabled?

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