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php实现头像预览上传功能

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

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 5 <title>无标题文档</title> 6  7 <link href="http://www.mamicode.com/bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet" type="text/css" /> 8 <script src="http://www.mamicode.com/bootstrap-3.3.7-dist/js/jquery-1.11.2.min.js"></script> 9 <script src="http://www.mamicode.com/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>10 11 <style type="text/css">12 #yl{ width:200px; height:200px; background-image:url(img/avatar.png); background-size:200px 200px;}13 #file{ width:200px; height:200px; float:left; opacity:0;}14 .modal-content{ width:500px;}15 .kk{ margin-left:130px;}16 </style>17 18 </head>19 20 <body>21 22 23 24 <!-- 按钮触发模态框 -->25 <button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">26     上传头像27 </button>28 <!-- 模态框(Modal) -->29 <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">30     <div class="modal-dialog">31         <div class="modal-content">32             <div class="modal-header">33                 <button type="button" class="close" data-dismiss="modal" aria-hidden="true">34                     &times;35                 </button>36                 <h4 class="modal-title" id="myModalLabel">37                     上传头像38                 </h4>39             </div>40             <div class="modal-body">41                 <form id="sc" action="upload.php" method="post" enctype="multipart/form-data" target="shangchuan">42     43     <input type="hidden" name="tp" value="" id="tp" />44     45     <div id="yl" class="kk">46         <input type="file" name="file" id="file" onchange="document.getElementById(‘sc‘).submit()" />47     </div>48     49     50     51 </form>52 53 <iframe style="display:none" name="shangchuan" id="shangchuan">54 </iframe>55 56             </div>57             <div class="modal-footer">58                 <button type="button" class="btn btn-default" data-dismiss="modal">关闭59                 </button>60                 <!--<button type="button" class="btn btn-primary">61                     提交更改62                 </button>-->63                 64             </div>65         </div><!-- /.modal-content -->66     </div><!-- /.modal -->67 </div>68 69 70 </body>71 72 <script type="text/javascript">73 74 //回调函数,调用该方法传一个文件路径,该变背景图75 function showimg(url)76 {77     var div = document.getElementById("yl");78     div.style.backgroundImage = "url("+url+")";79     80     document.getElementById("tp").value =http://www.mamicode.com/ url;81 }82 83 </script>84 85 </html>

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

2.upload.php

 1 <?php 2  3 if($_FILES["file"]["error"]) 4 { 5     echo $_FILES["file"]["error"]; 6 } 7 else 8 { 9     if(($_FILES["file"]["type"]=="image/jpeg" || $_FILES["file"]["type"]=="image/png")&& $_FILES["file"]["size"]<1024000000)10     {11         $fname = "./img/".date("YmdHis").$_FILES["file"]["name"];    12         13         $filename = iconv("UTF-8","gb2312",$fname);14         15         if(file_exists($filename))16         {17             echo "<script>alert(‘该文件已存在!‘);</script>";18         }19         else20         {21             move_uploaded_file($_FILES["file"]["tmp_name"],$filename);22             23             unlink($_POST["tp"]);24             25             echo "<script>parent.showimg(‘{$fname}‘);</script>";26         }27         28     }29 }

网页显示效果如下:

技术分享技术分享技术分享

好了,这样一个简单的头像上传就做好了,赶快试试吧!

php实现头像预览上传功能