Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Execute an external program
<?php exec(string $command, array &$output = null, int &$result_code = null): string|false
<?php             return false;

        }



        exec('stty 2>&1', $output, $exitcode);



        return self::$stty = $exitcode === 0;

    }