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.
SSH2_FINGERPRINT_MD5
     (integer)
   SSH2_FINGERPRINT_SHA1
     (integer)
   SSH2_FINGERPRINT_HEX
     (integer)
   SSH2_FINGERPRINT_RAW
     (integer)
   SSH2_TERM_UNIT_CHARS
     (integer)
   width and height
     are provided as character sizes.
    
   SSH2_TERM_UNIT_PIXELS
     (integer)
   width and height
     are provided in pixel units.
    
   SSH2_DEFAULT_TERM_WIDTH
     (integer)
   SSH2_DEFAULT_TERM_HEIGHT
     (integer)
   SSH2_DEFAULT_TERM_UNIT
     (integer)
   SSH2_STREAM_STDIO
     (integer)
   SSH2_STREAM_STDERR
     (integer)
   SSH2_DEFAULT_TERMINAL
     (string)