生成二维码的具体步骤如下所示：
1、在官网下载类库
在官网下载类库后，确保当前PHP环境支持GD2，然后我们只需要使用phpqrcode.php就可以生成二维码了。
phpqrcode.php提供了一个关键的png()方法，其中
参数$text表示生成二位的的信息文本；
参数$outfile表示是否输出二维码图片 文件，默认否；
参数$level表示容错率，也就是有被覆盖的区域还能识别，分别是 L（QR_ECLEVEL_L，7%），M（QR_ECLEVEL_M，15%），Q（QR_ECLEVEL_Q，25%），H（QR_ECLEVEL_H，30%）；
参数$size表示生成图片大小，默认是3；参数$margin表示二维码周围边框空白区域间距值；
参数$saveandprint表示是否保存二维码并显示。
2、下载后把解压后的phpqrcode文件夹放到extensions文件夹下，如下图：
3、引入类
Yii::$enableIncludePath = false;Yii::import ('application.extensions.phpqrcode.phpqrcode', 1 );4、具体代码
public function actionQrcode(){ $this->breadcrumbs=array_merge($this->breadcrumbs,array( '生成二维码' )); $qrcode_path=''; $file_tmp_name=''; $errors=array(); if(!empty($_POST)){ $content = trim($_POST['content']); //二维码内容 $contentSize=$this->getStringLength($content); if($contentSize>290){ $errors[]='字数过长，不能多于150个字符！'; } Yii::$enableIncludePath = false; Yii::import ('application.extensions.phpqrcode.phpqrcode', 1 ); if(isset($_FILES['upimage']['tmp_name']) && $_FILES['upimage']['tmp_name'] && is_uploaded_file($_FILES['upimage']['tmp_name'])){ if($_FILES['upimage']['size']>512000){ $errors[]="你上传的文件过大，最大不能超过500K。"; } $file_tmp_name=$_FILES['upimage']['tmp_name']; $fileext = array("image/pjpeg","image/jpeg","image/gif","image/x-png","image/png"); if(!in_array($_FILES['upimage']['type'],$fileext)){ $errors[]="你上传的文件格式不正确，仅支持 png, jpg, gif格式。"; } } $tpgs=$_POST['tpgs'];//图片格式 $bas_path=dirname ( Yii::app ()->BasePath ); $qrcode_bas_path=$bas_path.'/upload/qrcode/'; if(!is_dir($qrcode_bas_path)){ mkdir($qrcode_bas_path, 0777, true); } $uniqid_rand=date("Ymdhis").uniqid(). rand(1,1000); $qrcode_path=$qrcode_bas_path.$uniqid_rand. "_1.".$tpgs; $qrcode_path_new=$qrcode_bas_path.$uniqid_rand."_2.".$tpgs; if(Helper::getOS()=='Linux'){ $mv = move_uploaded_file($file_tmp_name, $qrcode_path); }else{ //解决windows下中文文件名乱码的问题 $save_path = Helper::safeEncoding($qrcode_path,'GB2312'); if(!$save_path){ $errors[]='上传失败，请重试！'; } $mv = move_uploaded_file($file_tmp_name, $qrcode_path); } if(empty($errors)){ $errorCorrectionLevel = $_POST['errorCorrectionLevel'];//容错级别 $matrixPointSize = $_POST['matrixPointSize'];//生成图片大小 $matrixMarginSize = $_POST['matrixMarginSize'];//边距大小 //生成二维码图片 QRcode::png($content,$qrcode_path_new, $errorCorrectionLevel, $matrixPointSize, $matrixMarginSize); $QR = $qrcode_path_new;//已经生成的原始二维码图 $logo = $qrcode_path;//准备好的logo图片 if (file_exists($logo)) { $QR = imagecreatefromstring(file_get_contents($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, $logo_height); //输出图片// header("Content-type: image/png"); imagepng($QR,$qrcode_path); imagedestroy($QR); }else{ $qrcode_path=$qrcode_path_new; } $qrcode_path=str_replace($bas_path,'', $qrcode_path); }else{ $qrcode_path=''; } } $data=array('data'=>array('errors'=>$errors,'qrcode_path'=>$qrcode_path)); $this->render ( 'qrcode',$data); }免费视频教程分享：php视频教程
4、前台的上传界面
<?php$vars = get_defined_vars ();$data = $vars ['data'];$content=Yii::app ()->request->hostInfo;$matrixPointSize=6;$matrixMarginSize=2;$errorCorrectionLevel='M';$tpgs='gif';if(!empty($_POST)){ $content=$_POST['content']; $matrixPointSize=$_POST['matrixPointSize']; $matrixMarginSize=$_POST['matrixMarginSize']; $errorCorrectionLevel=$_POST['errorCorrectionLevel']; $tpgs=$_POST['tpgs'];}$arrayCorrectionLevel=array('L'=>'L - Low (7%)','M'=>'M - Medium (15%)','Q'=>'Q - Quartile (25%)','H'=>'H - High (30%)');$arrayTpgs=array('gif'=>'gif格式','png'=>'png格式','jpg格式');?><div class="col-md-12"> <div class="form-horizontal panel panel-default margin-t-10 b-img"> <div class="panel-heading"> <div class="pull-left"> <span class="g-bg glyphicon glyphicon-wrench margin-r-2" aria-hidden="true"></span>在线生成二维码 </div> <div class="clearfix"></div> </div><?php$form = $this->beginWidget ( 'CActiveForm', array ( 'id' => 'qrcode-form', 'htmlOptions' => array ( 'id' => 'view_table', 'class' => 'add-form padding-10', 'enctype' => 'multipart/form-data' ), 'enableAjaxValidation' => false) );?> <div class="form-group"> <label class="col-lg-2 control-label">尺寸大小</label> <div class="col-lg-3"> <select class="form-control" id="matrixPointSize" name="matrixPointSize"> <?php for ($i=1;$i<21;$i++):?> <option value="<?php echo $i;?>" <?php echo $i==$matrixPointSize?'selected':'';?>><?php echo $i;?></option> <?php endfor;?> </select> </div> </div> <div class="form-group"> <label class="col-lg-2 control-label">边距大小</label> <div class="col-lg-3"> <select class="form-control" id="matrixMarginSize" name="matrixMarginSize"> <?php for ($i=0;$i<21;$i++):?> <option value="<?php echo $i;?>" <?php echo $i==$matrixMarginSize?'selected':'';?>><?php echo $i;?></option> <?php endfor;?> </select> </div> </div> <div class="form-group"> <label class="col-lg-2 control-label">容错级别</label> <div class="col-lg-3"> <?php echo CHtml::dropDownList('errorCorrectionLevel',$errorCorrectionLevel, $arrayCorrectionLevel,array('class'=>'form-control'));?> </div> </div> <div class="form-group"> <label class="col-lg-2 control-label">保存格式</label> <div class="col-lg-3"> <?php echo CHtml::dropDownList('tpgs',$tpgs, $arrayTpgs,array('class'=>'form-control'));?> </div> </div> <div class="form-group"> <label class="col-lg-2 control-label">二维码内容</label> <div class="col-lg-5"> <?php echo CHtml::textField('content',$content,array('class'=>'form-control','maxlength'=>150));?> </div> </div> <div class="form-group"> <label class="col-lg-2 control-label">二维码logo图片</label> <div class="col-lg-5"> <div class="col-md-6"> <input id="upimage" type="file" name="upimage" class="hidden"> <input id="tmp_file" class="form-control" type="text" value="gif，png，jpg"> </div> <div class="col-md-6"><a class="btn btn-default" onclick="$('input[id=upimage]').click();">选择文件</a></div> </div> </div> <div class="list_back"> <input type="submit" value="生成二维码" class="btn btn-success"> </div> </div><?php $this->endWidget(); ?> <div class="panel panel-default margin-t-10 b-img"> <div class="panel-heading"> <span class="g-bg glyphicon glyphicon-wrench margin-r-2" aria-hidden="true"></span>二维码 </div> <div class="panel-body"> <?php if(empty($_POST)):?> <?php echo CHtml::image('/static/tool/qrcode/qrcode.gif','二维码');?> <?php endif;?> <?php if(!empty($data['errors'])):?> <label class="col-lg-2 text-right">生成失败</label> <div class="col-lg-5"> <?php foreach ($data['errors'] as $e):?> <?php echo $e;?><br> <?php endforeach;?> </div> <?php endif;?> <?php if(!empty($data['qrcode_path'])):?> <?php echo CHtml::image($data['qrcode_path'],'二维码');?> <a class="btn btn-success color-f" href="<?php echo $data['qrcode_path'];?>" target="_blank"><span aria-hidden="true" class="glyphicon glyphicon-download-alt margin-r-2"></span>右键另存为二维码</a> <?php endif;?> </div> </div><?php $this->renderPartial('/component/duoshuo_common');?></div>最终效果如下：
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