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。
SSH2_FINGERPRINT_MD5
(int)
Flag to ssh2_fingerprint() requesting hostkey fingerprint as an MD5 hash.
SSH2_FINGERPRINT_SHA1
(int)
Flag to ssh2_fingerprint() requesting hostkey fingerprint as an SHA1 hash.
SSH2_FINGERPRINT_HEX
(int)
Flag to ssh2_fingerprint() requesting hostkey fingerprint as a string of hexits.
SSH2_FINGERPRINT_RAW
(int)
Flag to ssh2_fingerprint() requesting hostkey fingerprint as a raw string of 8-bit characters.
SSH2_TERM_UNIT_CHARS
(int)
Flag to ssh2_shell() specifying that
width and height
are provided as character sizes.
SSH2_TERM_UNIT_PIXELS
(int)
Flag to ssh2_shell() specifying that
width and height
are provided in pixel units.
SSH2_DEFAULT_TERM_WIDTH
(int)
Default terminal width requested by ssh2_shell().
SSH2_DEFAULT_TERM_HEIGHT
(int)
Default terminal height requested by ssh2_shell().
SSH2_DEFAULT_TERM_UNIT
(int)
Default terminal units requested by ssh2_shell().
SSH2_STREAM_STDIO
(int)
Flag to ssh2_fetch_stream() requesting STDIO subchannel.
SSH2_STREAM_STDERR
(int)
Flag to ssh2_fetch_stream() requesting STDERR subchannel.
SSH2_DEFAULT_TERMINAL
(string)
Default terminal type (e.g. vt102, ansi, xterm, vanilla) requested by ssh2_shell().
SSH2_POLLIN
(int)
SSH2_POLLEXT
(int)
SSH2_POLLOUT
(int)
SSH2_POLLERR
(int)
SSH2_POLLHUP
(int)
SSH2_POLLNVAL
(int)
SSH2_POLL_SESSION_CLOSED
(int)
SSH2_POLL_CHANNEL_CLOSED
(int)
SSH2_POLL_LISTENER_CLOSED
(int)