PHP_5_6_X_API_NO   28 ext/opcache/Optimizer/pass1_5.c #if ZEND_EXTENSION_API_NO >= PHP_5_6_X_API_NO
PHP_5_6_X_API_NO   48 ext/opcache/Optimizer/pass3.c #if ZEND_EXTENSION_API_NO >= PHP_5_6_X_API_NO
PHP_5_6_X_API_NO  110 ext/opcache/Optimizer/pass3.c #if ZEND_EXTENSION_API_NO >= PHP_5_6_X_API_NO
PHP_5_6_X_API_NO 1710 ext/opcache/ZendAccelerator.c #if ZEND_EXTENSION_API_NO < PHP_5_6_X_API_NO
PHP_5_6_X_API_NO  798 ext/opcache/zend_accelerator_util_funcs.c #if ZEND_EXTENSION_API_NO >= PHP_5_6_X_API_NO
PHP_5_6_X_API_NO  689 ext/opcache/zend_persist.c #if ZEND_EXTENSION_API_NO >= PHP_5_6_X_API_NO