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We have a PHP web app running on a customer's machine. For an update, we have a bit of code in C that we'd like to include as a native opaque library along with the PHP web app.
How does one go about calling a C/C++ lib. function from PHP?
It cannot be assumed that the PHP app, called by the web server, has any sort of permission to call an exec(), eval(), or system() type of function to execute a C wrapper driver which in turn uses the C/C++ library, so it would need to be a direct C library use from within the PHP code.
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PHP will not run your C code, even though they have similar syntaxes. The PHP exec function will execute a command similar to how it is done in a shell or command prompt. You could exec gcc -o myc myc.
It cannot be assumed that the PHP app, called by the web server, has any sort of permission to call an exec(), eval(), or system() type of function to execute a C wrapper driver which in turn uses the C/C++ library, so it would need to be a direct C library use from within the PHP code.
Put your main function's prototype in a . h file and include it in both your main and dynamic library code. With GCC, simply compile your main program with the -rdynamic flag. Once loaded, your library will be able to call the function from the main program.
Just declare the C function extern "C" (in your C++ code) and call it (from your C or C++ code). For example: // C++ code. extern "C" void f(int); // one way.
Take a look at some of the Zend tutorials on Extension writing, this one in particular "Wrapping C++ Classes in a PHP Extension"
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