PHP Extensions - What and Why

In ext/date/php_date.h:


PHP_FUNCTION(date_timezone_get);

In ext/date/php_date.c:


const zend_function_entry date_functions[] = {
    PHP_FE(date_timezone_get, arginfo_date_timezone_get)
    PHP_FE_END
};

const zend_function_entry date_funcs_date[] = {
    PHP_ME_MAPPING(createFromFormat, date_timezone_get,   arginfo_date_timezone_get, ZEND_ACC_PUBLIC)
    PHP_FE_END
};

PHP_FUNCTION(date_timezone_get)
{                   
    zval             *object;
    php_date_obj     *dateobj;
    php_timezone_obj *tzobj;
                        
    if (zend_parse_method_parameters(ZEND_NUM_ARGS() TSRMLS_CC, getThis(), "O", &object, date_ce_date) == FAILURE) {
        RETURN_FALSE;
    }
    dateobj = (php_date_obj *) zend_object_store_get_object(object TSRMLS_CC);
...
}