php实现头像上传预览功能

本文实例为大家分享了php实现头像上传预览功能的具体代码,供大家参考,具体内容如下

主页面1.php

<html>

<head>

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

<title>上传头像</title>

<style type="text/css">

*{

font-family:"微软雅黑";}

#zong{

/*border:1px solid black;*/

position:relative;

width:52%;

height:500x;

left:24%}

.nr{

float:left;

margin-right:30px;}

#yl{width:240px; height:240px; background-size:240px 240px;}

#file{width:240px; height:240px; float:left; opacity:0;}

</style>

</head>

<body>

<div id="zong">

<form id="sc" action="2.php" method="post" enctype="multipart/form-data" target="shangchuan">

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

<div id="yl" style="background-image:url(./image/1.jpg)" class="nr">//头像显示的位置

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

</div>

<div class="nr">

</div>

</form>

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

</iframe>

</div>

</body>

<script type="text/javascript">

//回调函数,调用该方法传一个文件路径,改变背景图

function showimg(url)

{

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

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

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

}

</script>

</html>

处理页面2.php

<?php

session_start();

$uid = $_SESSION["uid"];

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

{

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

}

else

{

if(($_FILES["file"]["type"]=="image/jpeg" || $_FILES["file"]["type"]=="image/png")&& $_FILES["file"]["size"]<1024000)

{

$fname = "./a/image/".date("YmdHis").$_FILES["file"]["name"]; //头像存储的路径

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

}

}

}

打开显示:

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