使用composer安装和使用Endroid/QrCode来生成二维码

现在很多框架都支持且仅支持使用composer来安装和管理，比如最新的thinkphp6，对于很多没接触过composer的人很迷茫，但在百度搜thinkphp6怎么生成二维码，大多没结果。
刚好最近在用thinkphp6重写一个项目，遇到生成二维码这块，显然之前的phpqrcode是不能再用了，而且composer上面也没有phpqrcode的版本，所以呢，用Endroid/QrCode替代，写好来分享给大家。
composer的介绍和安装今天先不说，直接进入“使用composer安装和使用endroid/QrCode来生成二维码”。

1、安装composer

2、使用composer命令安装Endroid/QrCode

code
composer require endroid/qr-code

3、实现代码
//生成二维码的功能无非就是：/二维码上的内容、二维码的尺寸大小、二维码上的LOGO、二维码上的文字….
在项目目录vendor\endroid\qr-code\src\QrCode.php

code
<?php

declare(strict_types=1);


namespace Endroid\QrCode;

use BaconQrCode\Encoder\Encoder;
use Endroid\QrCode\Exception\InvalidPathException;
use Endroid\QrCode\Exception\UnsupportedExtensionException;
use Endroid\QrCode\Writer\WriterInterface;

class QrCode implements QrCodeInterface
{
    const LABEL_FONT_PATH_DEFAULT = __DIR__.'/../assets/fonts/noto_sans.otf';

    private $text;

    private $size = 300;
    private $margin = 10;

    private $foregroundColor = [
        'r' => 0,
        'g' => 0,
        'b' => 0,
        'a' => 0,
    ];

    private $backgroundColor = [
        'r' => 255,
        'g' => 255,
        'b' => 255,
        'a' => 0,
    ];

    private $encoding = 'UTF-8';
    private $roundBlockSize = true;
    private $errorCorrectionLevel;

    private $logoPath;
    private $logoWidth;
    private $logoHeight;

    private $label;
    private $labelFontSize = 16;
    private $labelFontPath = self::LABEL_FONT_PATH_DEFAULT;
    private $labelAlignment;
    private $labelMargin = [
        't' => 0,
        'r' => 10,
        'b' => 10,
        'l' => 10,
    ];

    private $writerRegistry;
    private $writer;
    private $writerOptions = [];
    private $validateResult = false;

    public function __construct(string $text = '')
    {
        $this->text = $text;

        $this->errorCorrectionLevel = new ErrorCorrectionLevel(ErrorCorrectionLevel::LOW);
        $this->labelAlignment = new LabelAlignment(LabelAlignment::CENTER);

        $this->createWriterRegistry();
    }

    public function setText(string $text): void
    {
        $this->text = $text;
    }

    public function getText(): string
    {
        return $this->text;
    }

    public function setSize(int $size): void
    {
        $this->size = $size;
    }

    public function getSize(): int
    {
        return $this->size;
    }

    public function setMargin(int $margin): void
    {
        $this->margin = $margin;
    }

    public function getMargin(): int
    {
        return $this->margin;
    }

    public function setForegroundColor(array $foregroundColor): void
    {
        if (!isset($foregroundColor['a'])) {
            $foregroundColor['a'] = 0;
        }

        foreach ($foregroundColor as &$color) {
            $color = intval($color);
        }

        $this->foregroundColor = $foregroundColor;
    }

    public function getForegroundColor(): array
    {
        return $this->foregroundColor;
    }

    public function setBackgroundColor(array $backgroundColor): void
    {
        if (!isset($backgroundColor['a'])) {
            $backgroundColor['a'] = 0;
        }

        foreach ($backgroundColor as &$color) {
            $color = intval($color);
        }

        $this->backgroundColor = $backgroundColor;
    }

    public function getBackgroundColor(): array
    {
        return $this->backgroundColor;
    }

    public function setEncoding(string $encoding): void
    {
        $this->encoding = $encoding;
    }

    public function getEncoding(): string
    {
        return $this->encoding;
    }

    public function setRoundBlockSize(bool $roundBlockSize): void
    {
        $this->roundBlockSize = $roundBlockSize;
    }

    public function getRoundBlockSize(): bool
    {
        return $this->roundBlockSize;
    }

    public function setErrorCorrectionLevel(ErrorCorrectionLevel $errorCorrectionLevel): void
    {
        $this->errorCorrectionLevel = $errorCorrectionLevel;
    }

    public function getErrorCorrectionLevel(): ErrorCorrectionLevel
    {
        return $this->errorCorrectionLevel;
    }

    public function setLogoPath(string $logoPath): void
    {
        $logoPath = realpath($logoPath);

        if (!is_file($logoPath)) {
            throw new InvalidPathException('Invalid logo path: '.$logoPath);
        }

        $this->logoPath = $logoPath;
    }

    public function getLogoPath(): ?string
    {
        return $this->logoPath;
    }

    public function setLogoSize(int $logoWidth, int $logoHeight = null): void
    {
        $this->logoWidth = $logoWidth;
        $this->logoHeight = $logoHeight;
    }

    public function setLogoWidth(int $logoWidth): void
    {
        $this->logoWidth = $logoWidth;
    }

    public function getLogoWidth(): ?int
    {
        return $this->logoWidth;
    }

    public function setLogoHeight(int $logoHeight): void
    {
        $this->logoHeight = $logoHeight;
    }

    public function getLogoHeight(): ?int
    {
        return $this->logoHeight;
    }

    public function setLabel(string $label, int $labelFontSize = null, string $labelFontPath = null, string $labelAlignment = null, array $labelMargin = null): void
    {
        $this->label = $label;

        if (null !== $labelFontSize) {
            $this->setLabelFontSize($labelFontSize);
        }

        if (null !== $labelFontPath) {
            $this->setLabelFontPath($labelFontPath);
        }

        if (null !== $labelAlignment) {
            $this->setLabelAlignment($labelAlignment);
        }

        if (null !== $labelMargin) {
            $this->setLabelMargin($labelMargin);
        }
    }

    public function getLabel(): ?string
    {
        return $this->label;
    }

    public function setLabelFontSize(int $labelFontSize): void
    {
        $this->labelFontSize = $labelFontSize;
    }

    public function getLabelFontSize(): ?int
    {
        return $this->labelFontSize;
    }

    public function setLabelFontPath(string $labelFontPath): void
    {
        $resolvedLabelFontPath = realpath($labelFontPath);

        if (!is_string($resolvedLabelFontPath) || !is_file($resolvedLabelFontPath)) {
            throw new InvalidPathException('Invalid label font path: '.$labelFontPath);
        }

        $this->labelFontPath = $resolvedLabelFontPath;
    }

    public function getLabelFontPath(): ?string
    {
        return $this->labelFontPath;
    }

    public function setLabelAlignment(string $labelAlignment): void
    {
        $this->labelAlignment = new LabelAlignment($labelAlignment);
    }

    public function getLabelAlignment(): ?string
    {
        return $this->labelAlignment->getValue();
    }

    public function setLabelMargin(array $labelMargin): void
    {
        $this->labelMargin = array_merge($this->labelMargin, $labelMargin);
    }

    public function getLabelMargin(): ?array
    {
        return $this->labelMargin;
    }

    public function setWriterRegistry(WriterRegistryInterface $writerRegistry): void
    {
        $this->writerRegistry = $writerRegistry;
    }

    public function setWriter(WriterInterface $writer): void
    {
        $this->writer = $writer;
    }

    public function getWriter(string $name = null): WriterInterface
    {
        if (!is_null($name)) {
            return $this->writerRegistry->getWriter($name);
        }

        if ($this->writer instanceof WriterInterface) {
            return $this->writer;
        }

        return $this->writerRegistry->getDefaultWriter();
    }

    public function setWriterOptions(array $writerOptions): void
    {
        $this->writerOptions = $writerOptions;
    }

    public function getWriterOptions(): array
    {
        return $this->writerOptions;
    }

    private function createWriterRegistry()
    {
        $this->writerRegistry = new WriterRegistry();
        $this->writerRegistry->loadDefaultWriters();
    }

    public function setWriterByName(string $name)
    {
        $this->writer = $this->getWriter($name);
    }

    public function setWriterByPath(string $path): void
    {
        $extension = pathinfo($path, PATHINFO_EXTENSION);

        $this->setWriterByExtension($extension);
    }

    public function setWriterByExtension(string $extension): void
    {
        foreach ($this->writerRegistry->getWriters() as $writer) {
            if ($writer->supportsExtension($extension)) {
                $this->writer = $writer;

                return;
            }
        }

        throw new UnsupportedExtensionException('Missing writer for extension "'.$extension.'"');
    }

    public function writeString(): string
    {
        return $this->getWriter()->writeString($this);
    }

    public function writeDataUri(): string
    {
        return $this->getWriter()->writeDataUri($this);
    }

    public function writeFile(string $path): void
    {
        $this->getWriter()->writeFile($this, $path);
    }

    public function getContentType(): string
    {
        return $this->getWriter()->getContentType();
    }

    public function setValidateResult(bool $validateResult): void
    {
        $this->validateResult = $validateResult;
    }

    public function getValidateResult(): bool
    {
        return $this->validateResult;
    }

    public function getData(): array
    {
        $baconErrorCorrectionLevel = $this->errorCorrectionLevel->toBaconErrorCorrectionLevel();

        $baconQrCode = Encoder::encode($this->text, $baconErrorCorrectionLevel, $this->encoding);

        $matrix = $baconQrCode->getMatrix()->getArray()->toArray();

        foreach ($matrix as &$row) {
            $row = $row->toArray();
        }

        $data = ['matrix' => $matrix];
        $data['block_count'] = count($matrix[0]);
        $data['block_size'] = $this->size / $data['block_count'];
        if ($this->roundBlockSize) {
            $data['block_size'] = intval(floor($data['block_size']));
        }
        $data['inner_width'] = $data['block_size'] * $data['block_count'];
        $data['inner_height'] = $data['block_size'] * $data['block_count'];
        $data['outer_width'] = $this->size + 2 * $this->margin;
        $data['outer_height'] = $this->size + 2 * $this->margin;
        $data['margin_left'] = ($data['outer_width'] - $data['inner_width']) / 2;
        if ($this->roundBlockSize) {
            $data['margin_left'] = intval(floor($data['margin_left']));
        }
        $data['margin_right'] = $data['outer_width'] - $data['inner_width'] - $data['margin_left'];

        return $data;
    }
}

code
<？php
//引入composer自动生成的类加载器
require_once 'vendor/autoload.php';
//命名空间方式调用QrCode类
use Endroid\QrCode\ErrorCorrectionLevel;
use Endroid\QrCode\LabelAlignment;
use Endroid\QrCode\QrCode;
use Endroid\QrCode\Response\QrCodeResponse;
$qrCode = new QrCode();
$qrCode->setText('设置二维码上的内容'); //设置二维码上的内容
$qrCode->setSize(300); //二维码尺寸
$qrCode->setWriterByName('png'); //设置输出的二维码图片格式
$qrCode->setMargin(10);
$qrCode->setEncoding('UTF-8');
$qrCode->setErrorCorrectionLevel(ErrorCorrectionLevel::HIGH()); //设置二维码的纠错率，可以有low、medium、quartile、hign多个纠错率
$qrCode->setForegroundColor(['r' => 0, 'g' => 0, 'b' => 0, 'a' => 0]); //设置二维码的rgb颜色和透明度a，这里是黑色
$qrCode->setBackgroundColor(['r' => 255, 'g' => 255, 'b' => 255, 'a' => 0]); //设置二维码图片的背景底色，这里是白色
//可能的指定二维码下方的文字，写死15px的字体大小，字体
$qrCode->setLabelFontPath(__DIR__.'/vendor/endroid/qr-code/assets/fonts/noto_sans.otf'); //字体路径
$qrCode->setLabel('二维码下方的文字1'); //文字
$qrCode->setLabelFontSize(16); //字体大小
//或统一用setLabel('二维码下方的文字','字体大小','字体路径','对齐方式')来设置
$qrCode->setLabel('二维码下方的文字2', 16, __DIR__.'/vendor/endroid/qr-code/assets/fonts/noto_sans.otf', LabelAlignment::CENTER());
$qrCode->setLabelMargin(['t'=>50]); //设置标签边距 array('t' => 10,'r' => 20,'b' => 10,'l' => 30)
//如果要加上logo水印，则在调用setLogoPath和setLogoSize方法
$qrCode->setLogoPath(__DIR__.'/logo.png'); //logo水印图片的所在的路径
$qrCode->setLogoSize(150, 200); //设置logo水印的大小，单位px ，参数如果是一个int数字等比例缩放
//保存二维码
$qrCode->writeFile(__DIR__.'/qrcode.png');
//输出二维码
header('Content-Type: '.$qrCode->getContentType());
exit($qrCode->writeString());
？>

4、注意
QrCode生成中文汉字的label的时需要引入中文字体，所以需要调用setLabelFontPath方法传入一个中文字体的路径，QrCode默认提供的字体在\vendor\endroid\qrcode\assets\font路径下，但QrCode类并未默认调用，另外需要使用UTF8编码的中文设置label。

5、各参数详解
参数名 描述 示例
setText 设置文本 https://www.ymui.cn
setSize 设置二维码的大小，这里二维码应该是正方形的，所以相当于长宽 400
setMargin 设置二维码边距 10
setForegroundColor 设置前景色，RGB颜色 array(‘r’ => 0, ‘g’ => 0, ‘b’ => 0, ‘a’ => 0)
setBackgroundColor 设置背景色，RGB颜色 array(‘r’ => 0, ‘g’ => 0, ‘b’ => 0, ‘a’ => 0)
setEncoding 设置编码 utf8
setErrorCorrectionLevel 设置错误级别（low / medium / quartile / high） high
setLogoPath 设置logo路径 logo.png
setLogoWidth 设置logo大小 50
setLabel 设置标签 test
setLabelFontSize 设置标签字体大小 16
setLabelFontPath 设置标签字体路径 null
setLabelAlignment 设置标签对齐方式（left / center / right） center
setLabelMargin 设置标签边距 array(‘t’ => 10,’r’ => 20,’b’ => 10,’l’ => 30)
setWriterRegistry
setWriter
setWriterByName 写入文件的后缀名 png
setWriterByPath
setWriterByExtension
setValidateResult
writeString
writeDataUri
writeFile 写入文件 test.png
6、方法调用
$this->QrCode($data);//方法调用

code
 /**
 * 生成二维码方法
*/
public function QrCode($order_number)
{
    $content = 'http://fanxin.me:8080?order_number=' . $order_number;
    $url = root_path() . '/public/upload_resource/qrcode/' . $order_number . '.png';//存框架的位置
    $code_url = 'http://fanxin.me:8080/upload_resource/qrcode/' . $order_number . '.png';//二维码的访问地址
    $qrCode=new QrCode($content);
    // 指定内容类型
    header('Content-Type: ' . $qrCode->getContentType());
    // 输出二维码
    $qrCode->writeFile($url);
    return $code_url;
}