php建立带logo的二维码

 
<?php


/**
    php使用二维码
**/



class MyQrcode{

    const SIZE = 150;
    const LEVEL = "L";
    const MARGIN = 4;


    /**
        logo 存放logo文件的地址

        工厂方法建立二维码
    **/
    public static function factoryCreateQrcode($type, $string, $filename = false, $logo = null,$level = self::LEVEL, $size = self::SIZE,  $margin = self::MARGIN){
        $type = strtolower($type);
        if(!in_array($type, array("google", "php", "logo"))){
            return false;
        }
        $method = "createQrcodeFrom".ucfirst($type);
        return call_user_func_array(
            'self::'.$method,
            array($string, $filename, $logo, $level, $size, $margin, $logo)
            );

    }


  /**
     * google api 二维码生成【QRcode能够存储最多4296个字母数字类型的任意文本，具体能够查看二维码数据格式】
     * @param string $chl 二维码包含的信息，能够是数字、字符、二进制信息、汉字。不能混合数据类型，数据必须通过UTF-8 URL-encoded.若是须要传递的信息超过2K个字节，请使用POST方式
     * @param int $widhtHeight 生成二维码的尺寸设置
     * @param string $EC_level 可选纠错级别，QR码支持四个等级纠错，用来恢复丢失的、读错的、模糊的、数据。
     *                 L-默认：能够识别已损失的7%的数据
     *                 M-能够识别已损失15%的数据
     *                 Q-能够识别已损失25%的数据
     *                 H-能够识别已损失30%的数据
     * @param int $margin 生成的二维码离图片边框的距离
       @return 图像
     */
    public static function createQrcodeFromGoogle($string, $filename = false, $logo = null, $level = self::LEVEL, $size = self::SIZE,  $margin = self::MARGIN){
        return 'http://chart.apis.google.com/chart?chs='.$size.'x'.$size.'&cht=qr&chld='.$level.'|'.$margin.'&chl='.urlencode($string);
    }
    /**
        参数同上
    **/
    public static function createQrcodeFromPhp($string, $filename = false, $logo = null, $level = self::LEVEL, $size = self::SIZE, $margin = self::MARGIN)    {
        //加载你的php QR库
        $dir = dirname(__FILE__).DIRECTORY_SEPARATOR;
        require_once $dir."phpqrcode".DIRECTORY_SEPARATOR."phpqrcode.php";
        $filename = $dir.$filename;

        QRcode::png($string, $filename, $level, $size, $margin);
        return $filename;
    }

    public static function createQrcodeFromLogo($string, $filename = false, $logo = null, $level = self::LEVEL, $size = self::SIZE, $margin = self::MARGIN)   {
        $qrfile = self::createQrcodeFromPhp($string, $filename,$logo, $level, $size, $margin);
        return self::creatQrcodeWithLogo($logo, $qrfile);
    }

    /**
        @param $logo logo文件
        @param $qrfile qrfile本地文件
        @return 输出到本地文件或者输出到浏览器
    **/
    public static function creatQrcodeWithLogo($logo, $qrfile, $size=6)
 {
        if(!is_file($qrfile) || !is_file($logo)){
            return false;
        }
        $QR = imagecreatefrompng($qrfile);//外面那QR图
        if ($logo !== FALSE) {
          $logo = imagecreatefromstring(file_get_contents($logo));
          $QR_width = imagesx($QR);
          $QR_height = imagesy($QR);
          $logo_width = imagesx($logo);
          $logo_height = imagesy($logo);
          $logo_qr_width = $QR_width/$size;
          $scale = $logo_width/$logo_qr_width;
          $logo_qr_height = $logo_height/$scale;
          $from_width = ($QR_width-$logo_qr_width)/2;
          imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width, $logo_qr_height, $logo_width, $logo_height);
        }
        //二维码文件存在输出到文件不然输出到浏览器
        if(is_file($qrfile) && strpos($qrfile, "http") === false){
            imagepng($QR, $qrfile);
        } else{
            header('Content-type: image/png');
            imagepng($QR);
            imagedestroy($QR);
        }
    }

}

/*
$type = "php";
$string = "beck.bi";
$filename = "test1.png";
MyQrcode::factoryCreateQrcode($type, $string, $filename );
*/

/*
$type = "google";
$string = "beck";
var_dump(MyQrcode::factoryCreateQrcode($type, $string));
*/

$type = "logo";
$string = "beck.bi";
$filename = "test2.png";
$logo = "1.jpg";
MyQrcode::factoryCreateQrcode($type, $string, $filename, $logo);


?>