Calling C/C++ library function from PHP - How to send a -std=c+11 to compiler

I´ve found a solution. Here is the definitive code:

PHP_ARG_ENABLE(vehicles,
    [Whether to enable the "vehicles" extension],
    [  --enable-vehicles      Enable "vehicles" extension support])

if test $PHP_VEHICLES != "no"; then
    CXX_FLAGS="-std=c++0x"
    PHP_REQUIRE_CXX()
    PHP_SUBST(VEHICLES_SHARED_LIBADD)
    PHP_ADD_LIBRARY(stdc++, 1, VEHICLES_SHARED_LIBADD)
    PHP_NEW_EXTENSION(vehicles, vehicles.cc car.cc, $ext_shared)
fi

Make sure the CXX_FLAGS goes before PHP_REQUIRE_CXX() otherwise it won´t work.

There is also a macro called X_CXX_COMPILE_STDCXX_11([noext], [mandatory]) whose code is here that automates that process.

This solution not working for me. (With PHP7 extension) I found another solution

if test $PHP_VEHICLES != "no"; then
   CXXFLAGS="-std=c++11"
   PHP_REQUIRE_CXX()
   PHP_SUBST(VEHICLES_SHARED_LIBADD)
   PHP_ADD_LIBRARY(stdc++, 1, VEHICLES_SHARED_LIBADD)
   PHP_NEW_EXTENSION(vehicles, vehicles.cc car.cc, $ext_shared)
fi

So basically The only change is CXX_FLAGS="-std=c++0x" change to CXXFLAGS="-std=c++11"