<?php
/**
 * Created by PhpStorm.
 * User: Yang
 * Date: 2019/10/16
 * Time: 10:25
 */

class Encipher {

    private $_sourceFile = '';
    private $_encodedFile = '';
    private $_comments = array(
        'Author: Yang',
        'Email: 1017836267@qq.com'
    );

    public function __construct($sourceFile, $encodeFile, $comments = array())
    {
        !empty($sourceFile) && $this->_sourceFile = $sourceFile;
        !empty($encodeFile) && $this->_encodedFile = $encodeFile;
        !empty($comments) && $this->comments = (array)$comments;

        if (empty($this->_sourceFile) || !file_exists($this->_sourceFile)) {
            exit("Source file does not exist.");
        }
        if (empty($this->_encodedFile) || !file_exists($this->_encodedFile)) {
            //如果源文件不存在，则创建
            fopen($this->_encodedFile, "w");
        }
    }

    /**
     * 返回随机字符串
     * @return string
     */
    private function createRandKey()
    { // 返回随机字符串
        $str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
        return str_shuffle($str);
    }

    /**
     * 加密函数
     * @return bool
     */
    public function encode() {
        //随机密匙1
        $k1 = $this->createRandKey();
        //随机密匙2
        $k2 = $this->createRandKey();
        // 获取源文件内容
        $sourceContent = file_get_contents($this->_sourceFile);
        //base64加密
        $base64 = base64_encode($sourceContent);
        //根据密匙替换对应字符。
        $c = strtr($base64, $k1, $k2);
        $c = $k1 . $k2 . $c;
        $q1 = "O00O0O";
        $q2 = "O0O000";
        $q3 = "O0OO00";
        $q4 = "OO0O00";
        $q5 = "OO0000";
        $q6 = "O00OO0";
        $encodeContent = '$' . $q6 . '=urldecode("%6E1%7A%62%2F%6D%615%5C%76%740%6928%2D%70%78%75%71%79%2A6%6C%72%6B%64%679%5F%65%68%63%73%77%6F4%2B%6637%6A");$' . $q1 . '=$' . $q6 . '{3}.$' . $q6 . '{6}.$' . $q6 . '{33}.$' . $q6 . '{30};$' . $q3 . '=$' . $q6 . '{33}.$' . $q6 . '{10}.$' . $q6 . '{24}.$' . $q6 . '{10}.$' . $q6 . '{24};$' . $q4 . '=$' . $q3 . '{0}.$' . $q6 . '{18}.$' . $q6 . '{3}.$' . $q3 . '{0}.$' . $q3 . '{1}.$' . $q6 . '{24};$' . $q5 . '=$' . $q6 . '{7}.$' . $q6 . '{13};$' . $q1 . '.=$' . $q6 . '{22}.$' . $q6 . '{36}.$' . $q6 . '{29}.$' . $q6 . '{26}.$' . $q6 . '{30}.$' . $q6 . '{32}.$' . $q6 . '{35}.$' . $q6 . '{26}.$' . $q6 . '{30};eval($' . $q1 . '("' . base64_encode('$' . $q2 . '="' . $c . '";eval(\'?>\'.$' . $q1 . '($' . $q3 . '($' . $q4 . '($' . $q2 . ',$' . $q5 . '*2),$' . $q4 . '($' . $q2 . ',$' . $q5 . ',$' . $q5 . '),$' . $q4 . '($' . $q2 . ',0,$' . $q5 . '))));') . '"));';
        $headers = array_map('trim', array_merge(array('/*'), $this->_comments, array('*/')));
        $enCode = "<?php"."\r\n".implode("\r\n", $headers) . "\r\n".$encodeContent."\r\n"."?>";
        $file = fopen($this->_encodedFile, 'w');
        return fwrite($file, $enCode) or die('写文件错误');
    }
}

$e = new Encipher("element.php", "element_1.php");
$e ->encode();
echo "加密成功";