Thinkphp使用Zxing扩展库解析二维码内容图文讲解

一、下载PHP版本的Zxing扩展库

下载地址：https://github.com/khanamiryan/php-qrcode-detector-decoder

二、使用Zxing扩展库

1、文件下载好后，直接解压，结构如下，我们只需要lib这个文件夹

2、将lib文件夹重命名为Zxing，然后打开Zxing目录下的QrReader.php文件，可以发现命名空间是Zxing

3、接下来就很简单了，把Zxing文件夹放到thnikphp的扩展目录extend里

4、报错 Fatal error:: Allowed memory size of 134217728 bytes exhausted (tried to allocate 40 bytes) in

报错原因：PHP内存不够

解决方法：在调用QrReader前，先用ini_set()方法修改内存限制大小

//修改php内存限制为1024M
ini_set('memory_limit','1024M');

5、报错 Call to undefined function Zxing\Common\fill_array()

解决方法：修改Zxing目录的QrReader.php文件，载入common/customFunctions.php文件，如下：

<?php
namespace Zxing;

use Zxing\Common\HybridBinarizer;
use Zxing\Qrcode\QRCodeReader;
include_once('common/customFunctions.php');

final class QrReader
{
}

QrReader.php完整代码：

<?php
namespace Zxing;

use Zxing\Common\HybridBinarizer;
use Zxing\Qrcode\QRCodeReader;
include_once('common/customFunctions.php');

final class QrReader
{
 const SOURCE_TYPE_FILE  = 'file';
 const SOURCE_TYPE_BLOB  = 'blob';
 const SOURCE_TYPE_RESOURCE = 'resource';

 private $bitmap;
 private $reader;
 private $result;

 public function __construct($imgSource, $sourceType = QrReader::SOURCE_TYPE_FILE, $useImagickIfAvailable = true)
 {
  if (!in_array($sourceType, [
   self::SOURCE_TYPE_FILE,
   self::SOURCE_TYPE_BLOB,
   self::SOURCE_TYPE_RESOURCE,
  ], true)) {
   throw new \InvalidArgumentException('Invalid image source.');
  }
  $im = null;
  switch ($sourceType) {
   case QrReader::SOURCE_TYPE_FILE:
    if ($useImagickIfAvailable && extension_loaded('imagick')) {
     $im = new \Imagick();
     $im->readImage($imgSource);
    } else {
     $image = file_get_contents($imgSource);
     $im = imagecreatefromstring($image);
    }
    break;

   case QrReader::SOURCE_TYPE_BLOB:
    if ($useImagickIfAvailable && extension_loaded('imagick')) {
     $im = new \Imagick();
     $im->readImageBlob($imgSource);
    } else {
     $im = imagecreatefromstring($imgSource);
    }
    break;

   case QrReader::SOURCE_TYPE_RESOURCE:
    $im = $imgSource;
    if ($useImagickIfAvailable && extension_loaded('imagick')) {
     $useImagickIfAvailable = true;
    } else {
     $useImagickIfAvailable = false;
    }
    break;
  }
  if ($useImagickIfAvailable && extension_loaded('imagick')) {
   if (!$im instanceof \Imagick) {
    throw new \InvalidArgumentException('Invalid image source.');
   }
   $width = $im->getImageWidth();
   $height = $im->getImageHeight();
   $source = new IMagickLuminanceSource($im, $width, $height);
  } else {
   if (!is_resource($im)) {
    throw new \InvalidArgumentException('Invalid image source.');
   }
   $width = imagesx($im);
   $height = imagesy($im);
   $source = new GDLuminanceSource($im, $width, $height);
  }
  $histo  = new HybridBinarizer($source);
  $this->bitmap = new BinaryBitmap($histo);
  $this->reader = new QRCodeReader();
 }

 public function decode()
 {
  try {
   $this->result = $this->reader->decode($this->bitmap);
  } catch (NotFoundException $er) {
   $this->result = false;
  } catch (FormatException $er) {
   $this->result = false;
  } catch (ChecksumException $er) {
   $this->result = false;
  }
 }

 public function text()
 {
  $this->decode();

  if (method_exists($this->result, 'toString')) {
   return $this->result->toString();
  }

  return $this->result;
 }

 public function getResult()
 {
  return $this->result;
 }
}

6、在代码里调用

//引用
use Zxing\QrReader;
//调用类库
$qrcode = new QrReader("二维码图片路径");
$content = $qrcode->text();

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