Server : Apache/2.4.52 (Ubuntu) System : Linux webserver 6.8.0-49-generic #49~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Nov 6 17:42:15 UTC 2 x86_64 User : www-data ( 33) PHP Version : 8.1.2-1ubuntu2.21 Disable Function : NONE Directory :  /usr/share/php/phpseclib/

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<?php
/**
 * Bootstrapping File for phpseclib
 *
 * @license http://www.opensource.org/licenses/mit-license.html MIT License
 */

if (extension_loaded('mbstring')) {
    // 2 - MB_OVERLOAD_STRING
    // mbstring.func_overload is deprecated in php 7.2 and removed in php 8.0.
    if (version_compare(PHP_VERSION, '8.0.0') < 0 && ini_get('mbstring.func_overload') & 2) {
        throw new \UnexpectedValueException(
            'Overloading of string functions using mbstring.func_overload ' .
            'is not supported by phpseclib.'
        );
    }
}