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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 implicitly enabled.

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imap.enable_insecure_rsh boolean

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 insecure.