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.
SVN_REVISION_HEAD
     (integer)
   SVN_AUTH_PARAM_DEFAULT_USERNAME 
    (string)
   SVN_AUTH_PARAM_DEFAULT_PASSWORD 
    (string)
   SVN_AUTH_PARAM_NON_INTERACTIVE 
    (string)
   SVN_AUTH_PARAM_DONT_STORE_PASSWORDS 
    (string)
   SVN_AUTH_PARAM_NO_AUTH_CACHE 
    (string)
   SVN_AUTH_PARAM_SSL_SERVER_FAILURES 
    (string)
   SVN_AUTH_PARAM_SSL_SERVER_CERT_INFO 
    (string)
   SVN_AUTH_PARAM_CONFIG 
    (string)
   SVN_AUTH_PARAM_SERVER_GROUP 
    (string)
   SVN_AUTH_PARAM_CONFIG_DIR 
    (string)
   PHP_SVN_AUTH_PARAM_IGNORE_SSL_VERIFY_ERRORS 
    (string)
   SVN_FS_CONFIG_FS_TYPE 
    (string)
   SVN_FS_TYPE_BDB 
    (string)
   SVN_FS_TYPE_FSFS 
    (string)
   SVN_PROP_REVISION_DATE 
    (string)
   SVN_PROP_REVISION_ORIG_DATE 
    (string)
   SVN_PROP_REVISION_LOG 
    (string)
   SVN_WC_STATUS_NONE 
    (int)
   SVN_WC_STATUS_UNVERSIONED 
    (int)
   SVN_WC_STATUS_NORMAL 
    (int)
   SVN_WC_STATUS_ADDED 
    (int)
   SVN_WC_STATUS_MISSING 
    (int)
   SVN_WC_STATUS_DELETED 
    (int)
   SVN_WC_STATUS_REPLACED 
    (int)
   SVN_WC_STATUS_MODIFIED 
    (int)
   SVN_WC_STATUS_MERGED 
    (int)
   SVN_WC_STATUS_CONFLICTED 
    (int)
   SVN_WC_STATUS_IGNORED 
    (int)
   SVN_WC_STATUS_OBSTRUCTED 
    (int)
   SVN_WC_STATUS_EXTERNAL 
    (int)
   SVN_WC_STATUS_INCOMPLETE 
    (int)