Expect
PHP Manual

Predefined Constants

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.

EXP_GLOB (integer)
Indicates that the pattern is a glob-style string pattern.
EXP_EXACT (integer)
Indicates that the pattern is an exact string.
EXP_REGEXP (integer)
Indicates that the pattern is a regexp-style string pattern.
EXP_EOF (integer)
Value, returned by expect_expectl(), when EOF is reached.
EXP_TIMEOUT (integer)
Value, returned by expect_expectl() upon timeout of seconds, specified in value of expect.timeout
EXP_FULLBUFFER (integer)
Value, returned by expect_expectl() if no pattern have been matched.

Expect
PHP Manual