Description:
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For full details see: http://www.openwall.com/lists/oss-security/2015/01/27/9

We use this function in several places where userland input can be passed as a parameter to gethostbyname(). Given that a proof of concept RCE has been developed this could cause a potential issue for users who pass user supplied input these functions.

The Case Studies section of the oss-security link shows situations where apps are vulnerable or not.

Could someone please review http://lxr.php.net/search?q=gethostbyname&defs=&refs=&path=&hist=&project=PHP_5_6 and see if we can mitigate any potential vulnerabilities using the same techniques.