php-文件预览功能

php-文件预览

上一篇博客是上传功能，本篇是上传后图片预览和更改：

php-文件预览功能

代码如下：

1.yulan.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>
<style type="text/css">
#yl{ width:200px; height:300px; background-image:url(images/timg1.jpg); background-size:200px 300px;}
#file{ width:200px; height:300px; float:left; opacity:0;}
</style>
</head>

<body>

<form >
    
    
    <input type="hidden" name="tp" value=""  />
    
    <div >
        <input type="file" name="file"  />
    </div>
    
    
    
</form>

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


</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>

2.ylchuli.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"]<1024000)
    {
        $fname = "./images/".date("YmdHis").$_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);
            
            
            $delurl = iconv("UTF-8","gb2312",$_POST["tp"]);
            unlink($delurl); //删除文件
            
            echo "<script>parent.showimg('{$fname}');</script>";
        }
        
    }
}