The behaviour of these functions is affected by
settings in php.ini.
|imap.enable_insecure_rsh||“0”||PHP_INI_SYSTEM||Available as of PHP 7.1.25, 7.2.13 and 7.3.0. Formerly, it was
For further details and definitions of the PHP_INI_* modes, see the
configuration setting may be set.
Here’s a short explanation of the configuration
Establishing a connection to a server may invoke
rsh or ssh commands, unless this php.ini option is disabled.Warning
Neither PHP nor the IMAP library filter
mailbox names before passing them to rsh or ssh
commands, thus passing untrusted data to this function without
disabling this php.ini option is