PHP_5_5_X_API_NO  267 ext/opcache/Optimizer/pass1_5.c #if ZEND_EXTENSION_API_NO >= PHP_5_5_X_API_NO
PHP_5_5_X_API_NO   32 ext/opcache/Optimizer/zend_optimizer.c #if ZEND_EXTENSION_API_NO >= PHP_5_5_X_API_NO