加密：

<?php  
function encode_file_contents($filename) {  
    $type=strtolower(substr(strrchr($filename,'.'),1));  
    if('php'==$type && is_file($filename) && is_writable($filename)){// 如果是PHP文件    并且可写    则进行压缩编码  
        $contents = file_get_contents($filename);// 判断文件是否已经被编码处理  
        $pos = strpos($contents,'/*Protected by 草名 http://www.crazyi.cn Cryptation*/');  
        if(false === $pos || $pos>100){ // 去除PHP文件注释和空白，减少文件大小  
        $contents = php_strip_whitespace($filename);  
        // 去除PHP头部和尾部标识  
        $headerPos = strpos($contents,'<?php');  
        $footerPos = strrpos($contents,'?>');  
        $contents = substr($contents,$headerPos+5,$footerPos-$headerPos);  
        $encode = base64_encode(gzdeflate($contents));// 开始编码  
        $encode = '<?php'." /*Protected by 草名 http://www.crazyi.cn Cryptation*/\n eval(gzinflate(base64_decode(".$encode.")));\n /*Reverse    engineering is illegal and strictly prohibited- (C)草名 Cryptation 2008*/ \n?>";  
        return file_put_contents($filename,$encode);  
        }     
    }  
    return false;  
}  
//调用函数  
$filename='g:\我的文档\桌面\test.php';  
encode_file_contents($filename);  
?>

解密：

<?php  
$Code = '这里填写要解密的编码'; // base64编码  
$File = 'test.php';//解码后保存的文件  
$Temp = base64_decode($Code);  
$temp = gzinflate($Temp);  
$FP = fopen($File,"w");  
fwrite($FP,$temp);  
fclose($FP);  
echo "解密成功！";  
?>