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下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
YAR_VERSION
(string)
YAR_CLIENT_PROTOCOL_HTTP
(int)
YAR_OPT_PACKAGER
(int)
YAR_OPT_TIMEOUT
(int)
YAR_OPT_CONNECT_TIMEOUT
(int)
YAR_OPT_HEADER
(array)
YAR_PACKAGER_PHP
(string)
YAR_PACKAGER_JSON
(string)
YAR_ERR_OKEY
(int)
YAR_ERR_OUTPUT
(int)
YAR_ERR_TRANSPORT
(int)
YAR_ERR_REQUEST
(int)
YAR_ERR_PROTOCOL
(int)
YAR_ERR_PACKAGER
(int)
YAR_ERR_EXCEPTION
(int)
