I WOULD NOT CHANGE IT TO v1.
SSL v3 IS NOT THE SAME AS TLS v1
THERE IS A LOT OF CONFUSION IN THE PHP DOCUMENTATION and testing various approaches yields confusing results.
If you're uncomfortable with setting it to v4 (which technically doesn't yet exist), then simply comment-out the line, so that the version is auto-negotiated with the server. (Which is really the desired result anyway. The whole reason for specifying v3 initially was that v2 was deemed insecure but was the assumed default, but that has changed in modern PHP versions.)



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