加密PHP文件的方式，目测这样可以写个DLL来加密了

<?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 
$contents = php_strip_whitespace($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 
$encode = \'<?php\'."\n eval(gzinflate(base64_decode("."\'".$encode."\'".")));\n\n?>"; 

return file_put_contents($filename, $encode); 
} 
return false; 
} 

//调用函数 
$filename = \'dam.php\'; 
encode_file_contents($filename); 
echo "OK,加密完成！" 
?>