Merge branch 'pull-request/499'
Fix RFC 6598 IPv4 Reserved Range Checks
Need a way to check whether this API exists
Merge branch 'PHP-5.5'
Revert "Need a way to check whether this API exists"

hmm, we can check whether the head file exists instead

This reverts commit 4d7d85640dd8e48166e4fd5dbf04aeb18a9e01c4.
Merge branch 'PHP-5.5'