PHP gzinflate加密脚本

<?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 Hzllaga https://www.wtfsec.org/ 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 Hzllaga https://www.wtfsec.org/ Cryptation*/\n eval(gzinflate(base64_decode(\"" . $encode . "\")));\n?>";
            return file_put_contents($filename, $encode);
        }
    }
    return false;
}
//调用函数
$filename = 'Hzllaga.php';
encode_file_contents($filename);
?>