php实现头像预览上传功能

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最近在做php第二阶段的项目，需要用到头像上传的功能

我们要完成头像上传功能，一共要写两个php页面，第一个页面我们叫做touxiang.php，第二个页面我们叫做upload.php

1.touxiang.php

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

 <html xmlns="http://www.w3.org/1999/xhtml">

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

 <title>无标题文档</title>

 <link href="bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet" type="text/css" />

 <script src="bootstrap-3.3.7-dist/js/jquery-1.11.2.min.js"></script>

 <script src="bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>

 <style type="text/css">

 #yl{ width:200px; height:200px; background-image:url(img/avatar.png); background-size:200px 200px;}

 #file{ width:200px; height:200px; float:left; opacity:0;}

 .modal-content{ width:500px;}

 .kk{ margin-left:130px;}

 </style>

 </head>

 <body>

 <!-- 按钮触发模态框 -->

 <button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">

     上传头像

 </button>

 <!-- 模态框（Modal） -->

 <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">

     <div class="modal-dialog">

         <div class="modal-content">

             <div class="modal-header">

                 <button type="button" class="close" data-dismiss="modal" aria-hidden="true">

                     &times;

                 </button>

                 <h4 class="modal-title" id="myModalLabel">

                     上传头像

                 </h4>

             </div>

             <div class="modal-body">

                 <form id="sc" action="upload.php" method="post" enctype="multipart/form-data" target="shangchuan">

     <input type="hidden" name="tp" value="" id="tp" />

     <div id="yl" class="kk">

         <input type="file" name="file" id="file" onchange="document.getElementById('sc').submit()" />

     </div>

 </form>

 <iframe style="display:none" name="shangchuan" id="shangchuan">

 </iframe>

             </div>

             <div class="modal-footer">

                 <button type="button" class="btn btn-default" data-dismiss="modal">关闭

                 </button>

                 <!--<button type="button" class="btn btn-primary">

                     提交更改

                 </button>-->

             </div>

         </div><!-- /.modal-content -->

     </div><!-- /.modal -->

 </div>

 </body>

 <script type="text/javascript">

 //回调函数,调用该方法传一个文件路径，该变背景图

 function showimg(url)

 {

     var div = document.getElementById("yl");

     div.style.backgroundImage = "url("+url+")";

     document.getElementById("tp").value = url;

 }

 </script>

 </html>

在这个页面我们需要引入一个模态框和bootstrap.min.css，jquery-1.11.2.min.js，bootstrap.min.js三个文件

2.upload.php

 <?php

 if($_FILES["file"]["error"])

 {

     echo $_FILES["file"]["error"];

 }

 else

 {

     if(($_FILES["file"]["type"]=="image/jpeg" || $_FILES["file"]["type"]=="image/png")&& $_FILES["file"]["size"]<1024000000)

     {

         $fname = "./img/".date("YmdHis").$_FILES["file"]["name"];    

         $filename = iconv("UTF-8","gb2312",$fname);

         if(file_exists($filename))

         {

             echo "<script>alert('该文件已存在！');</script>";

         }

         else

         {

             move_uploaded_file($_FILES["file"]["tmp_name"],$filename);

             unlink($_POST["tp"]);

             echo "<script>parent.showimg('{$fname}');</script>";

         }

     }

 }