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
<?phpsession_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:
点击图片位置弹出选择框：
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持网页设计。
