The simplest and most practical goolge open source method

1.google open api

The code is as follows:

$urlToEncode="http://www.helloweba.com"; 
generateQRfromGoogle($urlToEncode); 
/** 
 * google api 二維碼生成【QRcode可以存儲最多4296個(gè)字母數(shù)字類型的任意文本，具體可以查看二維碼數(shù)據(jù)格式】 
 * @param string $chl 二維碼包含的信息，可以是數(shù)字、字符、二進(jìn)制信息、漢字。 
 不能混合數(shù)據(jù)類型，數(shù)據(jù)必須經(jīng)過UTF-8 URL-encoded 
 * @param int $widhtHeight 生成二維碼的尺寸設(shè)置 
 * @param string $EC_level 可選糾錯(cuò)級別，QR碼支持四個(gè)等級糾錯(cuò)，用來恢復(fù)丟失的、讀錯(cuò)的、模糊的、數(shù)據(jù)。 
 *                            L-默認(rèn)：可以識別已損失的7%的數(shù)據(jù) 
 *                            M-可以識別已損失15%的數(shù)據(jù) 
 *                            Q-可以識別已損失25%的數(shù)據(jù) 
 *                            H-可以識別已損失30%的數(shù)據(jù) 
 * @param int $margin 生成的二維碼離圖片邊框的距離 
 */ 
function generateQRfromGoogle($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 Support for GD2 must be enabled. 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 add our own LOGO in the middle of the QR code to enhance 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 function to add the pre-prepared logo image to the middle of the original QR code image just generated, and then regenerate a new one. QR code picture.

include 'phpqrcode.php';  
$value = 'http://www.helloweba.com'; //二維碼內(nèi)容 
$errorCorrectionLevel = 'L';//容錯(cuò)級別 
$matrixPointSize = 6;//生成圖片大小 
//生成二維碼圖片 
QRcode::png($value, 'qrcode.png', $errorCorrectionLevel, $matrixPointSize, 2); 
$logo = 'logo.png';//準(zhǔn)備好的logo圖片 
$QR = 'qrcode.png';//已經(jīng)生成的原始二維碼圖 
  
if ($logo !== FALSE) { 
    $QR = imagecreatefromstring(file_get_contents($QR)); 
    $logo = imagecreatefromstring(file_get_contents($logo)); 
    $QR_width = imagesx($QR);//二維碼圖片寬度 
    $QR_height = imagesy($QR);//二維碼圖片高度 
    $logo_width = imagesx($logo);//logo圖片寬度 
    $logo_height = imagesy($logo);//logo圖片高度 
    $logo_qr_width = $QR_width / 5; 
    $scale = $logo_width/$logo_qr_width; 
    $logo_qr_height = $logo_height/$scale; 
    $from_width = ($QR_width - $logo_qr_width) / 2; 
    //重新組合圖片并調(diào)整大小 
    imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width,  
    $logo_qr_height, $logo_width, $logo_height); 
} 
//輸出圖片 
imagepng($QR, 'helloweba.png'); 
echo &#39;<img src="helloweba.png">&#39;;

For the second method: If $filename is not used and the second parameter is 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. Directly call it as follows:

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

You can also call it in the following way:

$("#code").qrcode({ 
    render: "table", //table方式 
    width: 200, //寬度 
    height:200, //高度 
    text: "www.helloweba.com" //任意內(nèi)容 });

This will generate a QR code directly on the page, and you can use the "scan" function of your mobile phone to read it. Get the QR code information.

(4).識別中文

我們試驗(yàn)的時(shí)候發(fā)現(xiàn)不能識別中文內(nèi)容的二維碼，通過查找多方資料了解到，jquery-qrcode是采用charCodeAt()方式進(jìn)行編碼轉(zhuǎn)換的。而這個(gè)方法默認(rèn)會獲取它的Unicode編碼，如果有中文內(nèi)容，在生成二維碼前就要把字符串轉(zhuǎn)換成UTF-8，然后再生成二維碼。您可以通過以下函數(shù)來轉(zhuǎn)換中文字符串：

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("普羅旺斯沒有故事"); 
$('#code').qrcode(str);

本文介紹了php生成二維碼的三種方法，更多相關(guān)內(nèi)容請關(guān)注php中文網(wǎng)。

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