Find PHP4
This module finds if PHP4 is installed and determines where the include files and libraries are. It also determines what the name of the library is. This code sets the following variables:
PHP4_INCLUDE_PATH = path to where php.h can be found PHP4_EXECUTABLE = full path to the php4 binary
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/module/FindPHP4.html