PHP-生成二维码（qr-code）

这样，就可以把二维码显示在页面的任意位置了。当然，我们也可以把它存入文件中，生成一个任意格式的图片，比如说：

$qrCode->writeFile(__DIR__ . "/qrcode.png");

这样我们就可以根据图片路径在页面上展示二维码了

这里，我贴出一个简单的类处理文件，并介绍一下qr-code 常用的一些参数。

类文件：

namespace "命名空间";

use EndroidQrCodeErrorCorrectionLevel;
use EndroidQrCodeLabelAlignment;
use EndroidQrCodeQrCode;

class QrcodeComponent
{
    protected $_qr;
    protected $_encoding = "UTF-8";
    protected $_size = 300;
    protected $_logo = false;
    protected $_logo_url = "";
    protected $_logo_size = 80;
    protected $_title = false;
    protected $_title_content = "";
    protected $_generate = "display"; // display-直接显示 writefile-写入文件
    const MARGIN = 10;
    const WRITE_NAME = "png";
    const FOREGROUND_COLOR = ["r" => 0, "g" => 0, "b" => 0, "a" => 0];
    const BACKGROUND_COLOR = ["r" => 255, "g" => 255, "b" => 255, "a" => 0];

    public function __construct($config) {
        isset($config["generate"]) && $this->_generate = $config["generate"];
        isset($config["encoding"]) && $this->_encoding = $config["encoding"];
        isset($config["size"]) && $this->_size = $config["size"];
        isset($config["display"]) && $this->_size = $config["size"];
        isset($config["logo"]) && $this->_logo = $config["logo"];
        isset($config["logo_url"]) && $this->_logo_url = $config["logo_url"];
        isset($config["logo_size"]) && $this->_logo_size = $config["logo_size"];
        isset($config["title"]) && $this->_title = $config["title"];
        isset($config["title_content"]) && $this->_title_content = $config["title_content"];
    }

    /**
     * 生成二维码
     * @param $content 需要写入的内容
     * @return array | page input
     */
    public function create($content) {
        $this->_qr = new QrCode($content);
        $this->_qr->setSize($this->_size);
        $this->_qr->setWriterByName(self::WRITE_NAME);
        $this->_qr->setMargin(self::MARGIN);
        $this->_qr->setEncoding($this->_encoding);
        $this->_qr->setErrorCorrectionLevel(ErrorCorrectionLevel::HIGH);
        $this->_qr->setForegroundColor(self::FOREGROUND_COLOR);
        $this->_qr->setBackgroundColor(self::BACKGROUND_COLOR);
        if ($this->_title) {
            $this->_qr->setLabel($this->_title_content, 16, "字体地址", LabelAlignment::CENTER);
        }
        if ($this->_logo) {
            $this->_qr->setLogoPath($this->_logo_url);
            $this->_qr->setLogoWidth($this->_logo_size);
            $this->_qr->setRoundBlockSize(true);
        }
        $this->_qr->setValidateResult(false);

        if ($this->_generate == "display") {
            // 前端调用 例：
            header("Content-Type: " . $this->_qr->getContentType());
            return $this->_qr->writeString();
        } else if ($this->_generate == "writefile") {
            return $this->_qr->writeString();
        } else {
            return ["success" => false, "message" => "the generate type not found", "data" => ""];
        }
    }

    /**
     * 生成文件
     * @param $file_name 目录文件 例: /tmp
     * @return array
     */
    public function generateImg($file_name) {
        $file_path = $file_name . DS . uniqid() . "." . self::WRITE_NAME;

        if (!file_exists($file_name)) {
            mkdir($file_name, 0777, true);
        }

        try {
            $this->_qr->writeFile($file_path);
            $data = [
                "url" => $file_path,
                "ext" => self::WRITE_NAME,
            ];
            return ["success" => true, "message" => "write qrimg success", "data" => $data];
        } catch (Exception $e) {
            return ["success" => false, "message" => $e->getMessage(), "data" => ""];
        }
    }
}

使用方法：

use "命名空间";

$qr_url = "http://www.baidu.com?id=" . rand(1000, 9999);
$file_name = "/tmp";

// 直接输出
$qr_code = new QrcodeComponent();
$qr_img = qr_code->create($qr_url);
echo $qr_img;

// 生成文件
$config = [
    "generate" => "writefile",
];
$qr_code = new QrcodeComponent($config);
$qr_img = $qr_code->create($qr_url);
$rs = $qr_code->generateImg($file_name);
print_r($rs);

常用参数解释：

setSize - 二维码大小 px
setWriterByName - 写入文件的后缀名
setMargin - 二维码内容相对于整张图片的外边距
setEncoding - 编码类型
setErrorCorrectionLevel - 容错等级，分为L、M、Q、H四级
setForegroundColor - 前景色
setBackgroundColor - 背景色
setLabel - 二维码标签
setLogoPath - 二维码logo路径
setLogoWidth - 二维码logo大小 px