#include "php.h" static const zend_function_entry my_module_functions[] = { PHP_FE(my_module_function, NULL) {NULL, NULL, NULL} // end of function list }; static zend_module_entry my_module_entry = { #if ZEND_MODULE_API_NO >= 20010901 STANDARD_MODULE_HEADER, #endif "my_module", // module name my_module_functions, // function list NULL, // module startup function NULL, // module shutdown function NULL, // request startup function NULL, // request shutdown function NULL, // module info function #if ZEND_MODULE_API_NO >= 20010901 "1.0", // module version #endif STANDARD_MODULE_PROPERTIES }; // initialize the module ZEND_GET_MODULE(my_module) // define the custom PHP function PHP_FUNCTION(my_module_function) { // implementation here... }In the code example above, we define a custom PHP function called "my_module_function" and register it as a function entry in the "my_module_functions" array. We also define the module entry itself, including its functions, version number, and other module properties. Finally, we use the "ZEND_GET_MODULE" macro to initialize the module and make its functions available to PHP scripts.