PHP常用函数

    function reformMD5($pwd) {
        $totalStr = "JINRONGGONGCHANGAPPMD520141224INJINYUDASHAJINHONGDONGPRODUCT";
        $pwd = strtoupper($pwd);
        $pwd = str_replace(range(0, 9), array('~', '$', '!', '@', ':', ']', '[', '{', '}', '`'), $pwd);
        $totalStr = substr($totalStr, 0, strlen($totalStr) - strlen($pwd));
        $pwd = $totalStr . $pwd;
        return md5($pwd);
    }
    
    
    /*
     * AES 加密
    *  */
    function encrypt($key, $value) {
        $padSize = 16 - (strlen($value) % 16);
        $value = $value . str_repeat(chr($padSize), $padSize);
        $output = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $value, MCRYPT_MODE_CBC, str_repeat(chr(0), 16));
        return base64_encode($output);
    }
    
    /*
    
    * AES 解密
    *  */
    function decrypt($key, $value) {
        $value = base64_decode($value);
        $output = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $value, MCRYPT_MODE_CBC, str_repeat(chr(0), 16));
    
        $valueLen = strlen($output);
        if ($valueLen % 16 > 0)
            $output = "";
    
        $padSize = ord($output{$valueLen - 1});
        if (($padSize < 1) or ( $padSize > 16))
            $output = "";                // Check padding.
    
        for ($i = 0; $i < $padSize; $i++) {
            if (ord($output{$valueLen - $i - 1}) != $padSize)
                $output = "";
        }
        $output = substr($output, 0, $valueLen - $padSize);
    
        return $output;
    }
    
    /*
     * 生成36位随字符串
    */
    
    function makeKey() {
        return uniqid(uniqid(), true);
    }
    
    /*
     生成验证码
    *  */
    function makecode($code, $width = 80, $height = 28, $quality = 3) {
        $fontcfg = array('spacing' => 2);
        $fontfile ='../assets/font/ninab.ttf';
        $fontcolors = array(array(27, 78, 181), array(22, 163, 35), array(214, 36, 7), array(88, 127, 30), array(66, 133, 244), array(241, 147, 0), array(232, 0, 0), array(196, 146, 1));
        $im = imagecreatetruecolor($width * $quality, $height * $quality);
        $imbgcolor = imagecolorallocate($im, 255, 255, 255);
        imagefilledrectangle($im, 0, 0, $width * $quality, $height * $quality, $imbgcolor);
    
        $lettersMissing = 4 - strlen($code);
        $fontSizefactor = 0.9 + ($lettersMissing * 0.09);
        $x = 4 * $quality;
        $y = round(($height * 27 / 32) * $quality);
        $length = strlen($code);
        for ($i = 0; $i < $length; $i++) {
            $color = $fontcolors[mt_rand(0, sizeof($fontcolors) - 1)];
            $imbgcolor = imagecolorallocate($im, $color[0], $color[1], $color[2]);
            $degree = rand(8 * -1, 8);
            $fontsize = 22 * $quality * $fontSizefactor;
            $letter = substr($code, $i, 1);
            $coords = imagettftext($im, $fontsize, $degree, $x, $y, $imbgcolor, $fontfile, $letter);
            $x += ($coords[2] - $x) + ($fontcfg['spacing'] * $quality);
        }
        $x1 = $width * $quality * .15;
        $x2 = $x;
        $y1 = rand($height * $quality * .40, $height * $quality * .65);
        $y2 = rand($height * $quality * .40, $height * $quality * .65);
        $lwidth = 0.5 * $quality;
        for ($i = $lwidth * -1; $i <= $lwidth; $i++) {
            imageline($im, $x1, $y1 + $i, $x2, $y2 + $i, $imbgcolor);
        }
        $imResampled = imagecreatetruecolor($width, $height);
        imagecopyresampled($imResampled, $im, 0, 0, 0, 0, $width, $height, $width * $quality, $height * $quality);
        imagedestroy($im);
        $im = $imResampled;
        header("Content-type: image/jpeg");
        imagejpeg($im, null, 80);
        imagedestroy($im);
    }
    
    function random($length = 6, $type = 0) {
        $hash = '';
        $chararr = array(
                'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz',
                '0123456789',
                '23456789ABCDEFGHJKLMNPQRSTUVWXYZ'
        );
        $chars = $chararr[$type];
        $max = strlen($chars) - 1;
        PHP_VERSION < '4.2.0' && mt_srand((double) microtime() * 1000000);
        for ($i = 0; $i < $length; $i++) {
            $hash .= $chars[mt_rand(0, $max)];
        }
        return $hash;
    }
function gzdecode ($data) {
        $flags = ord(substr($data, 3, 1));
        $headerlen = 10;
        $extralen = 0;
        $filenamelen = 0;
        if ($flags & 4) {
            $extralen = unpack('v' ,substr($data, 10, 2));
            $extralen = $extralen[1];
            $headerlen += 2 + $extralen;
        }
        if ($flags & 8) // Filename
            $headerlen = strpos($data, chr(0), $headerlen) + 1;
        if ($flags & 16) // Comment
            $headerlen = strpos($data, chr(0), $headerlen) + 1;
        if ($flags & 2) // CRC at end of file
            $headerlen += 2;
        $unpacked = @gzinflate(substr($data, $headerlen));
        if ($unpacked === FALSE)
            $unpacked = $data;
        return $unpacked;
    }

    /*
     * 生成36位随字符串
    */
    
    function makeKey() {
        return uniqid(uniqid(), true);
    

mcrypt_encripty加密解密：

    # --- 加密 ---

    # 密钥应该是随机的二进制数据，
    # 开始使用 scrypt, bcrypt 或 PBKDF2 将一个字符串转换成一个密钥
    # 密钥是 16 进制字符串格式
    $key = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3");
    
    # 显示 AES-128, 192, 256 对应的密钥长度：
    #16，24，32 字节。
    $key_size =  strlen($key);
    echo "Key size: " . $key_size . "<br>
";
    
    $plaintext = "This string was AES-256 / CBC / ZeroBytePadding encrypted.";

    # 为 CBC 模式创建随机的初始向量
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    

    # 创建和 AES 兼容的密文（Rijndael 分组大小 = 128）
    # 仅适用于编码后的输入不是以 00h 结尾的
    # （因为默认是使用 0 来补齐数据）
    $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key,
                                 $plaintext, MCRYPT_MODE_CBC, $iv);

    # 将初始向量附加在密文之后，以供解密时使用
    $ciphertext = $iv . $ciphertext;
    
    # 对密文进行 base64 编码
    $ciphertext_base64 = base64_encode($ciphertext);

    echo  $ciphertext_base64 . "<br>
";

    # === 警告 ===

    # 密文并未进行完整性和可信度保护，
    # 所以可能遭受 Padding Oracle 攻击。
    
    # --- 解密 ---
    $key_dec = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3");
    $ciphertext_dec = base64_decode($ciphertext_base64);
    
    # 初始向量大小，可以通过 mcrypt_get_iv_size() 来获得
    $iv_size_dec = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
    $iv_dec = substr($ciphertext_dec, 0, $iv_size_dec);
    
    # 获取除初始向量外的密文
    $ciphertext_dec = substr($ciphertext_dec, $iv_size_dec);

    # 可能需要从明文末尾移除 0
    $plaintext_dec = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key_dec,
                                    $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);
    
    echo  $plaintext_dec . "
";