php 异步上传图片几种方法总结
要实现异步上传图片方法有常用的有二种，一种是利用iframe实现，另一种是借助于ajax来实现一般用第三方插件了。
上传图片form提交target到一个隐藏的iframe里，
<form action="upload.php" id="form1" name="form1" enctype="multipart/form-data" method="post" target="uploadIframe"> <!--上传图片页面 --> </form>
然后后台处理完上传图片逻辑后返回给前台，利用ajax修改当前页面DOM对象实现无刷新上传图片的友好功能。
实例
<form enctype="multipart/form-data" action="a.php" target="ifram_sign" method="POST"> <input name="submit" id="submit" value="" type="hidden"> <label>上传文件: <input name="test_file" type="file" id="test_file" size="48"></label> <input type="image" value="立即上传" id="submit_btn"> </form> <iframe name="ifram_sign" class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="" frameborder="0" height="0" width="0" marginheight="0" marginwidth="0"></iframe>
PHP代码：
<?php
if ($_FILES["test_file"]["error"] > 0)
{
echo "Error: " . $_FILES["test_file"]["error"] . "<br />";
}
else
{
//这里的判断图片属性的方法就不写了。自己扩展一下。
$filetype=strrchr($_FILES["test_file"]["name"],".");
$filetype=substr($filetype,1,strlen($filetype));
$filename="img/".time("YmdHis").".".$filetype;
move_uploaded_file($_FILES["test_file"]["tmp_name"],$filename);
echo '<script >alert(1)</script>';
$return="parent.document.getElementByIdx_x('mpic".$pageset_id."').innerHTML='".$dataimgpath."'";
echo "<script >alert('上传成功')</script>";
echo "<script>{$return}</script>";
}
?>其实jquery ajax图片异步上传
HTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "1/DTD/xhtml1-transitional.dtd">
<html xmlns="" lang="en_US" xml:lang="en_US">
<head> <title>图片异步上传</title></head>
<script type="text/javascript" class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="js/jquery.js"></script>
<script type="text/javascript" class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="js/index.js"></script>
<link type="text/css" rel="stylesheet" href="css/index.css">
<body>
<div class="frm">
<form name="uploadFrom" id="uploadFrom" action="upload.php" method="post" target="tarframe" enctype="multipart/form-data">
<input type="file" id="upload_file" name="upfile">
</form>
<iframe class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="" width="0" height="0" name="tarframe">
</iframe>
</div>
<div id="msg">
</div>
</body>
</html>
index.js
$(function(){ $("#upload_file").change(function(){ $("#uploadFrom").submit(); });});
function stopSend(str){ var im="<img src='upload/images/"+str+"'>"; $("#msg").append(im);
}upload.php
<?php
$file=$_FILES['upfile'];
$name=rand(0,500000).dechex(rand(0,10000)).".jpg";
move_uploaded_file($file['tmp_name'],"upload/images/".$name);
//调用iframe父窗口的js 函数
echo "<script>parent.stopSend('$name')</script>";?>
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