<?php$file_upload = "upload/";$file_allow_ext='gif|jpg|jpeg|png|gif|zip|rar|ppt|xls|pdf|pptx|xlsx|docx';$file_allow_size = 5*1024*1024;if($_POST['submit']=="上傳"){ if(is_uploaded_file($_FILES['file']['tmp_name'])){  $file_name = $_FILES['file']['name'];  $file_error = $_FILES['file']['error'];  $file_type = $_FILES['file']['type'];  $file_tmp_name = $_FILES['file']['tmp_name'];   $file_size = $_FILES['file']['size'];  $file_ext = substr($file_name, strrpos($file_name, '.')+1);  switch($file_error){  case 0:  $data['status'] = 0;  $data['msg'] = "文件上傳成功!";    break;  case 1:  $data['status'] = 1;  $data['msg'] = "文件上傳失敗，文件大小".$file_size."超過限制,允許上傳大小".sizeFormat($file_allow_size)."!";    break;  case 3:  $data['status'] = 1;  $data['msg'] = "上傳失敗，文件只有部份上傳!";    break;  case 4:  $data['status'] = 1;  $data['msg'] = "上傳失敗，文件沒有被上傳!";    break;  case 5:  $data['status'] = 1;  $data['msg'] = "文件上傳失敗，文件大小為0!";    break;   }  if(stripos($file_allow_ext,$file_ext)===false){  $data['status'] = 1;  $data['msg'] = "該文件擴展名不允許上傳";    }  if($file_size>$file_allow_size){    $data['status'] = 1;  $data['msg'] = "文件大小超過限制,只能上傳".sizeFormat($file_allow_size)."的文件!";   }   if($data['status']==1){  $data['status'] = 1;  $data['msg'] = $data['msg'];  exit(json_encode($data));   }  if($data['status']==0){  if(file_exists($file_upload)){      $file_new_name = date("YmdHis").'_'.rand(10000,99999).'.'.$file_ext;   $file_save_path = $file_upload.$file_new_name;    $data['status'] = 0;     $data['url'] = $file_save_path;   move_uploaded_file($file_tmp_name,$file_save_path);   exit(json_encode($data));      }else{   exit(json_encode($data));  }    }    }}function sizeFormat($size){ $sizeStr=''; if($size<1024) {  return $size."bytes"; } else if($size<(1024*1024)) {  $size=round($size/1024,1);  return $size."KB"; } else if($size<(1024*1024*1024)) {  $size=round($size/(1024*1024),1);  return $size."MB"; } else {  $size=round($size/(1024*1024*1024),1);  return $size."GB"; } }?>

<script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js"></script><script type="text/javascript" src="http://files.cnblogs.com/files/china-li/jquery.form.js"></script><form action="dofile.php" method="post" enctype="multipart/form-data" id="upfileimage"><input type="hidden" name="image[]" /><label for="file">文件:</label><input type="file" name="file" id="file" /><input type="submit" name="submit" value="上傳" /></form><script type="text/javascript">$("#upfileimage").submit(function(){ if($("input[type=file]").val()==""){  alert("請選擇要上傳的文件");  return false; }})$(function(){ var options = {    type:"POST",  dataType:"json",  resetForm:true,  success:function(o){   if(o.status==1){   alert(o.msg);   }else{   $("body").append("  <img src='"+o.url+"'   }  },  error:function(o){   alert(o.message);  }   } $("#upfileimage").ajaxForm(options).submit(function(){return false;});})</script>