Three ways to generate QR codes in php

The simplest and most practical goolge open source method

Recommended manual: php complete self-study manual

1.google open api

The code is as follows:

$urlToEncode="http://www.helloweba.com"; 
generateQRfromGoogle($urlToEncode); 
/** 
 * google api 二维码生成【QRcode可以存储最多4296个字母数字类型的任意文本，具体可以查看二维码数据格式】 
 * @param string $chl 二维码包含的信息，可以是数字、字符、二进制信息、汉字。 
 不能混合数据类型，数据必须经过UTF-8 URL-encoded 
 * @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：可以识别已损失的7%的数据 
 *                            M-可以识别已损失15%的数据 
 *                            Q-可以识别已损失25%的数据 
 *                            H-可以识别已损失30%的数据 
 * @param int $margin 生成的二维码离图片边框的距离 
 */ 
function generateQRfromGoogle($chl,$widhtHeight ='150',$EC_level='L',$margin='0') 
{ 
    $chl = urlencode($chl); 
    echo &#39;<img src="http://chart.apis.google.com/chart?chs=&#39;.$widhtHeight.&#39;x&#39;.$widhtHeight.&#39; 
    &cht=qr&chld=&#39;.$EC_level.&#39;|&#39;.$margin.&#39;&chl=&#39;.$chl.&#39;" alt="QR code" widhtHeight="&#39;.$widhtHeight.&#39; 
    " widhtHeight="&#39;.$widhtHeight.&#39;"/>&#39;; 
}

2.php class library PHP QR Code

##Address: http://phpqrcode.sourceforge.net/Download: http://sourceforge.net/projects/phpqrcode/

After downloading the class library provided by the official website, you only need to use phpqrcode.php to generate the QR code. Of course, your PHP environment must enable GD2 support. phpqrcode.php provides a key png() method, in which the parameter $text indicates the generation of two-digit information text; the parameter $outfile indicates whether to output a QR code image file, the default is no; the parameter $level indicates the fault tolerance rate, that is The covered areas can still be identified, which are L (QR_ECLEVEL_L, 7%), M (QR_ECLEVEL_M, 15%), Q (QR_ECLEVEL_Q, 25%), H (QR_ECLEVEL_H, 30%); the parameter $size indicates the size of the generated image , the default is 3; the parameter $margin indicates the spacing value of the blank area of ​​the border around the QR code; the parameter $saveandprint indicates whether to save the QR code and display it.

The code is as follows:

public static function png($text, $outfile=false, $level=QR_ECLEVEL_L, $size=3, $margin=4,  
$saveandprint=false)  
{ 
    $enc = QRencode::factory($level, $size, $margin); 
    return $enc->encodePNG($text, $outfile, $saveandprint=false); 
}

Calling PHP QR Code:

include 'phpqrcode.php'; 
QRcode::png('http://www.helloweba.com');

In actual application, we will Adding your own LOGO in the middle of the QR code has enhanced the publicity effect. So how to generate a QR code containing a logo?

In fact, the principle is very simple. First use PHP QR Code to generate a QR code image, and then use PHP's image related functions to add the pre-prepared logo image to the newly generated original in the middle of the QR code image, and then regenerate a new QR code image.

include 'phpqrcode.php';  
$value = 'http://www.helloweba.com'; //二维码内容 
$errorCorrectionLevel = 'L';//容错级别 
$matrixPointSize = 6;//生成图片大小 
//生成二维码图片 
QRcode::png($value, 'qrcode.png', $errorCorrectionLevel, $matrixPointSize, 2); 
$logo = 'logo.png';//准备好的logo图片 
$QR = 'qrcode.png';//已经生成的原始二维码图 
  
if ($logo !== FALSE) { 
    $QR = imagecreatefromstring(file_get_contents($QR)); 
    $logo = imagecreatefromstring(file_get_contents($logo)); 
    $QR_width = imagesx($QR);//二维码图片宽度 
    $QR_height = imagesy($QR);//二维码图片高度 
    $logo_width = imagesx($logo);//logo图片宽度 
    $logo_height = imagesy($logo);//logo图片高度 
    $logo_qr_width = $QR_width / 5; 
    $scale = $logo_width/$logo_qr_width; 
    $logo_qr_height = $logo_height/$scale; 
    $from_width = ($QR_width - $logo_qr_width) / 2; 
    //重新组合图片并调整大小 
    imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width,  
    $logo_qr_height, $logo_width, $logo_height); 
} 
//输出图片 
imagepng($QR, 'helloweba.png'); 
echo &#39;<img src="helloweba.png">&#39;;

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##For the second method: If you do not use $filename, the first When the two parameters are false, the QR code image will not be saved, but will be output directly.

There are still some if you like: libqrencode and QRcode Perl CGI & PHP scripts QR code generation plug-in. If you like it, you can also take a look.

3. Based on jquery's QR code generation plug-in qrcode, the corresponding QR code can be generated by calling the plug-in on the page.

qrcode actually implements graphic rendering and drawing by using jQuery, and supports canvas (HTML5) and table.

You can go to https://github.com/jeromeetienne/jquery-qrcode to get the latest code.

How to use

(1), first add the jquery library file and qrcode plug-in to the page.

<script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="jquery.qrcode.min.js"></script>

(2). Add the following code to the page where the QR code needs to be displayed:

<p id="code"></p>

(3). Call the qrcode plug-in.

qrcode supports two methods of canvas and table for image rendering. The canvas method is used by default, which is the most efficient. Of course, the browser must support html5. Direct call as follows:

$('#code').qrcode("http://www.helloweba.com"); //任意字符串

您也可以通过以下方式调用：

$("#code").qrcode({ 
    render: "table", //table方式 
    width: 200, //宽度 
    height:200, //高度 
    text: "www.helloweba.com" //任意内容 });

这样就可以在页面中直接生成一个二维码，你可以用手机“扫一扫”功能读取二维码信息。

(4).识别中文

我们试验的时候发现不能识别中文内容的二维码，通过查找多方资料了解到，jquery-qrcode是采用charCodeAt()方式进行编码转换的。而这个方法默认会获取它的Unicode编码，如果有中文内容，在生成二维码前就要把字符串转换成UTF-8，然后再生成二维码。您可以通过以下函数来转换中文字符串：

function toUtf8(str) {    
    var out, i, len, c;    
    out = "";    
    len = str.length;    
    for(i = 0; i < len; i++) {    
        c = str.charCodeAt(i);    
        if ((c >= 0x0001) && (c <= 0x007F)) {    
            out += str.charAt(i);    
        } else if (c > 0x07FF) {    
            out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));    
            out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));    
            out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));    
        } else {    
            out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));    
            out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));    
        }    
    }    
    return out;    }

以下示例：

var str = toUtf8("普罗旺斯没有故事"); 
$('#code').qrcode(str);

本文介绍了php生成二维码的三种方法，更多相关内容请关注php中文网。

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