Runtime Configuration

    The behaviour of these functions is affected by settings in php.ini.

    IMAP Configure Options
    NameDefaultChangeableChangelog
    imap.enable_insecure_rsh"0"INI_SYSTEMAvailable as of PHP 7.1.25, 7.2.13 and 7.3.0. Formerly, it was implicitly enabled.
    For further details and definitions of the INI_* modes, see the Where a configuration setting may be set.

    Here's a short explanation of the configuration directives.

    imap.enable_insecure_rshbool

    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.

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