两种php实现图片上传的方法，
两种php实现图片上传的方法，
图片上传在项目中经常用到，几乎没有任何一个项目可以脱离图片或者是文件上传。本篇我在这向大家介绍两种常规的上传方式。（注：在这里我们仅仅是对功能的实现，不去做过多的前端的样式）
一、利用form表单上传
此种方式是最原始的上传方式，前端就是简单的form表单，后端我们有PHP处理传输过来的文件。
首先看前端的代码 upload.html
<form action="handle.php" name="form" method="post" enctype="multipart/form-data"> <input type="file" name="file" /> <input type="submit" name="submit" value="上传" /> </form>
然后新建php文件 handle.php 代码如下
$file = $_FILES['file'];//得到传输的数据
//得到文件名称
$name = $file['name'];
$type = strtolower(substr($name,strrpos($name,'.')+1)); //得到文件类型，并且都转化成小写
$allow_type = array('jpg','jpeg','gif','png'); //定义允许上传的类型
//判断文件类型是否被允许上传
if(!in_array($type, $allow_type)){
//如果不被允许，则直接停止程序运行
return ;
}
//判断是否是通过HTTP POST上传的
if(!is_uploaded_file($file['tmp_name'])){
//如果不是通过HTTP POST上传的
return ;
}
$upload_path = "D:/now/"; //上传文件的存放路径
//开始移动文件到相应的文件夹
if(move_uploaded_file($file['tmp_name'],$upload_path.$file['name'])){
echo "Successfully!";
}else{
echo "Failed!";
}
当然，此php处理代码不是很完善，其中对错误的情况没有进行处理，然而使用php处理上传文件的原理就是这样的，大家可以在此基础上进行优化，使其更加完善。
二、利用uploadify实现无刷新并且带进度条的上传
首先下载uploadify插件，保存在项目中的某个文件夹下面，然后引入三个文件
<link href="js/uploadify/uploadify.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="js/uploadify/jquery.min.1.7.js"></script> <script type="text/javascript" src=js/uploadify/jquery.uploadify.min.js"></script>
然后引用以下代码
<script type="text/javascript">
$(function(){
$(".uploadbutton").each(function(){
bidtype="上传";
$(this).uploadify({
swf: 'js/uploadify/uploadify.swf',
uploader: "handle.php", //处理上传的php文件或者方法
multi: true, //是否开启一次性上传多个文件
queueSizeLimit:20, //最大允许上传的文件数量
buttonText: bidtype, //按钮文字
height: 34, //按钮高度
width: 82, //按钮宽度
auto:false, //选择完图片以后是否自动上传
method:'post',
fileTypeExts: "*.jpg;*.png;*.gif;*.jpeg;", //允许的文件类型
fileTypeDesc: "请选择图片文件", //文件说明
postData:{},
formData: { "imgType": "normal","timestamp":"asdfsa","token":"48f262516b3912a060d21ef6af564668" }, //提交给服务器端的参数
onUploadSuccess: function (file, data, response) { //一个文件上传成功后的响应事件处理
var data = $.parseJSON(data);
}
});
})
});
</script>
<body>
<span id="commercial_upload" class="uploadbutton"></span>
</body>
样式如下
当然此按钮的样式我改动过，大家可以根据自己的需要修改样式文件，改变此按钮的样式
同样的php代码 handle.php
$file = $_FILES['Filedata'];//得到传输的数据
//得到文件名称
$name = $file['name'];
$type = strtolower(substr($name,strrpos($name,'.')+1)); //得到文件类型，并且都转化成小写
$allow_type = array('jpg','jpeg','gif','png'); //定义允许上传的类型
//判断文件类型是否被允许上传
if(!in_array($type, $allow_type)){
//如果不被允许，则直接停止程序运行
return ;
}
//判断是否是通过HTTP POST上传的
if(!is_uploaded_file($file['tmp_name'])){
//如果不是通过HTTP POST上传的
return ;
}
$upload_path = "D:/now/"; //上传文件的存放路径
//开始移动文件到相应的文件夹
if(move_uploaded_file($file['tmp_name'],$upload_path.$file['name'])){
echo "Successfully!";
}else{
echo "Failed!";
}
以上两种方式上传可以说PHP处理的原理是相同的，只是前台显示的样式不同，第二种方式是无刷新，并且带有返回值，可以方便我们做其它的处理。虽然常用，但是总归会受限制，使用起来不是很灵活。
随着html5的发展的越来越成熟，我们可以利用h5中的一些方法实现上传功能，此时后台PHP的处理代码完全不同于以上两种方式，并且使用起来很灵活。由于篇幅限制，本篇我不向大家介绍这种方式，有兴趣的可以参考php+html5实现无刷新图片上传教程，希望大家会喜欢。
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