In qh_intset.h:
PHP_METHOD(QuickHashIntSet, __construct);
PHP_METHOD(QuickHashIntSet, getSize);
PHP_METHOD(QuickHashIntSet, add);
PHP_METHOD(QuickHashIntSet, exists);
PHP_METHOD(QuickHashIntSet, delete);
...
In qh_intset.c:
zend_function_entry qh_funcs_intset[] = {
    PHP_ME(QuickHashIntSet, __construct,    arginfo_qh_intset_construct,        ZEND_ACC_CTOR|ZEND_ACC_PUBLIC)
    PHP_ME(QuickHashIntSet, getSize,        arginfo_qh_intset_get_size,         ZEND_ACC_PUBLIC)
    PHP_ME(QuickHashIntSet, add,            arginfo_qh_intset_add,              ZEND_ACC_PUBLIC)
    PHP_ME(QuickHashIntSet, exists,         arginfo_qh_intset_exists,           ZEND_ACC_PUBLIC)
    PHP_ME(QuickHashIntSet, delete,         arginfo_qh_intset_exists,           ZEND_ACC_PUBLIC)
...
    {NULL, NULL, NULL}
};

PHP_METHOD(QuickHashIntSet, getSize)   
{   
...
}