base64+gzinflate压缩编码（加密）过的文件通常是以 <? eval(gzinflate(base64_decode( 为头的一个php文件。文中给出了编码和解码的代码。
php压缩编码（加密）源代码：
<?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  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 
$encode = '<?php'." /*Protected Cryptation*/\n eval(gzinflate(base64_decode(".$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); 
?> 
<?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 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 
$encode = '<?php'." /*Protected by  Cryptation*/\n eval(gzinflate(base64_decode(".$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); 
?> 
 
php压缩解码（php解密）源代码：
 
<?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！"; 
?>