@H_502_0@本文实例讲述了PHP+ajax实现带进度条的上传图片功能。分享给大家供大家参考，具体如下：

@H_502_0@运行效果图如下：

@H_502_0@

@H_502_0@代码如下：

<div class="jb51code">
<pre class="brush:PHP;">
<?php
if(isset($_FILES["FileInput"]) && $_FILES["FileInput"]["error"]== UPLOAD_ERR_OK)
{
############ Edit settings ##############
$UploadDirectory = 'F:/Websites/file_upload/uploads/'; //specify upload directory ends with / (slash)
##########################################
/
Note : You will run into errors or blank page if "memory_limit" or "upload_max_filesize" is set to low in "php.ini".
Open "php.ini" file,and search for "memory_limit" or "upload_max_filesize" limit
and set them adequately,also check "post_max_size".
/
//check if this is an ajax request
if (!isset($_SERVER['HTTP_X_REQUESTED_WITH'])){
die();
}
//Is file size is less than allowed size.
if ($_FILES["FileInput"]["size"] > 5242880) {
die("File size is too big!");
}
//allowed file type Server side check
switch(strtolower($_FILES['FileInput']['type']))
{
//allowed file types
case 'image/png':
case 'image/gif':
case 'image/jpeg':
case 'image/pjpeg':
case 'text/plain':
case 'text/html': //html file
case 'application/x-zip-compressed':
case 'application/pdf':
case 'application/msword':
case 'application/vnd.ms-excel':
case 'video/mp4':
break;
default:
die('Unsupported File!'); //output error
}
$File_Name = strtolower($_FILES['FileInput']['name']);
$File_Ext = substr($File_Name,strrpos($File_Name,'.')); //get file extention
$Random_Number = rand(0,9999999999); //Random number to be added to name.
$NewFileName = $Random_Number.$File_Ext; //new file name
if(move_uploaded_file($_FILES['FileInput']['tmp_name'],$UploadDirectory.$NewFileName ))
{
die('Success! File Uploaded.');
}else{
die('error uploading File!');
}
}
else
{
die('Something wrong with upload! Is "upload_max_filesize" set correctly?');
}