The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
YAR_VERSION
     (string)
    YAR_CLIENT_PROTOCOL_HTTP
     (integer)
    YAR_CLIENT_OPT_PACKAGER
     (integer)
    YAR_CLIENT_OPT_TIMEOUT
     (integer)
    YAR_CLIENT_OPT_CONNECT_TIMEOUT
     (integer)
    YAR_PACKAGER_PHP
     (string)
    YAR_PACKAGER_JSON
     (string)
    YAR_ERR_OKEY
     (integer)
    YAR_ERR_OUTPUT
     (integer)
    YAR_ERR_TRANSPORT
     (integer)
    YAR_ERR_REQUEST
     (integer)
    YAR_ERR_PROTOCOL
     (integer)
    YAR_ERR_PACKAGER
     (integer)
    YAR_ERR_EXCEPTION
     (integer)