Changes in SAPI Modules
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In PHP 5, a listen directive with only a port number would listen on all interfaces, but only on IPv4. PHP 7 will now accept requests made via both IPv4 and IPv6.
FPM
Unqualified listen ports now listen on both IPv4 and IPv6
In PHP 5, a listen directive with only a port number would listen on all interfaces, but only on IPv4. PHP 7 will now accept requests made via both IPv4 and IPv6.
This does not affect directives which include specific IP addresses; these will continue to only listen on that address and protocol.