php 上传图片，无刷新上传，支持多图上传,远程图片上传

 1 <html>
 2 <head>
 3     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 4     <title>无标题文档</title>
 5     <script type="text/javascript">
 6         function startUpload() {
 7             // document.getElementById('processing').innerHTML = 'loding...';
 8             return true;
 9         }
10         function stopUpload(rel){
11             var rel = eval('(' + rel + ')');
12             document.getElementById('processing').innerHTML = document.getElementById('processing').innerHTML + '<img src="'+rel.thumbMap+'" alt="">';
13         }
14     </script>
15 </head>
16 
17 <body style="font-size:12px;">
18 <div id="processing"></div>
19 
20 <form action="upload.php" method="post" enctype="multipart/form-data" onsubmit="startUpload();" target="form-target" name="form1">
21     本地图片：<input type="file" name="file"><br>
22     远程图片：<input type="text" name="url"><br>
23     <input type="submit" name="Submit" value="提交">
24     <input name="scan" type="hidden" id="up" value="true">
25 </form>
26 <iframe style="0; height:0; border:0;" name="form-target"></iframe>
27 <b /><br/>
28 </body>
29 </html>

  1 <?php
  2 class ieb_upload
  3 {
  4     public $FormName; //文件域名称
  5     public $Directroy; //上传至目录
  6     public $MaxSize; //最大上传大小
  7     public $CanUpload = true; //是否可以上传
  8     public $doUpFile = ''; //上传的文件名
  9     public $sm_File = ''; //缩略图名称
 10     public $Error = 0; //错误参数
 11 
 12     // 初始化(1024*2)*1024=2097152 就是 2M
 13     public function ieb_upload($FormName = '', $dirPath = '', $maxSize = 2097152) {
 14         // 初始化各种参数
 15         $this->FormName = $FormName;
 16         $this->MaxSize = $maxSize;
 17         if ($this->FormName == '') {
 18             $this->CanUpload = false;
 19             $this->Error = 1;
 20             return;
 21         }
 22         $this->Directroy = $dirPath."/";
 23     }
 24 
 25     //获取远程图片
 26     public function GrabImage($url) {
 27         if($url=="") return false;
 28 
 29         $ext=strrchr($url,".");
 30         if($ext!=".gif" && $ext!=".jpg" && $ext!=".png") { return false; }
 31         //echo $filename=date("YmdHis").$ext;
 32         $fileName = $this->Directroy.$this->newName().$ext; //主图地址
 33         $this->createDir(dirname($fileName));
 34 
 35         ob_start();
 36         readfile($url);
 37         $img = ob_get_contents();
 38         ob_end_clean();
 39         $size = strlen($img);
 40         $fp2 = @fopen($fileName, "a");
 41         fwrite($fp2,$img);
 42         fclose($fp2);
 43 
 44         $this->doUpFile = $fileName;
 45 
 46         chmod($this->sm_File.$fileName, 0777);
 47         return true;
 48     }
 49 
 50     // 上传文件
 51     public function upload() {
 52         if ($this->CanUpload) {
 53             if ($_FILES[$this->FormName]['size'] == 0) {
 54                 $this->Error = 3;
 55                 $this->CanUpload = false;
 56                 return $this->Error;
 57             }
 58 
 59             $fileName =$this->Directroy.$this->newName().".".$this->getExt(); //主图地址
 60             $this->createDir(dirname($fileName));
 61             $doUpload = @copy($_FILES[$this->FormName]['tmp_name'], $fileName);
 62 
 63             if ($doUpload) {
 64                 $this->doUpFile = $fileName;
 65                 chmod($this->sm_File.$fileName, 0777);
 66                 return true;
 67             } else {
 68                 $this->Error = 4;
 69                 return $this->Error;
 70             }
 71         }
 72     }
 73 
 74     // 创建图片缩略图
 75     public function thumb($dscChar = '', $width = 150, $height = 150) {
 76         if ($this->CanUpload && $this->doUpFile != '') {
 77 
 78             if ($dscChar == '')
 79                 $dscChar = 'sm_';
 80 
 81             $data = getimagesize($this->doUpFile, $info);
 82 
 83             switch ($data[2]) {
 84                 case 1:
 85                     $this->sm_File = $this->doUpFile.$dscChar.".gif";
 86                     $im = @imagecreatefromgif($this->doUpFile);
 87                     break;
 88                 case 2:
 89                     $this->sm_File = $this->doUpFile.$dscChar.".jpg";
 90                     $im = @imagecreatefromjpeg($this->doUpFile);
 91                     break;
 92                 case 3:
 93                     $this->sm_File = $this->doUpFile.$dscChar.".png";
 94                     $im = @imagecreatefrompng($this->doUpFile);
 95                     break;
 96             }
 97 
 98             $srcW = imagesx($im);
 99             $srcH = imagesy($im);
100             $ni = imagecreatetruecolor($width, $height);
101             imagecopyresized($ni, $im, 0, 0, 0, 0, $width, $height, $srcW, $srcH);
102             $cr = imagejpeg($ni, $this->sm_File);
103             chmod($this->sm_File, 0777);
104 
105             if ($cr) {
106                 return true;
107             } else {
108                 $this->Error = 5;
109                 return $this->Error;
110             }
111         }
112     }
113 
114     // 检查文件是否存在
115     public function scanFile() {
116         if ($this->CanUpload) {
117             $scan = is_readable($_FILES[$this->FormName]['name']);
118             if ($scan)
119                 $this->Error = 2;
120             return $scan;
121         }
122     }
123 
124     // 获取文件大小
125     public function getSize($format = 'B') {
126         if ($this->CanUpload) {
127             if ($_FILES[$this->FormName]['size'] == 0) {
128                 $this->Error = 3;
129                 $this->CanUpload = false;
130             }
131             switch ($format) {
132                 case 'B':return $_FILES[$this->FormName]['size'];break;
133                 case 'K':return ($_FILES[$this->FormName]['size']) / (1024);break;
134                 case 'M':return ($_FILES[$this->FormName]['size']) / (1024 * 1024);break;
135             }
136         }
137     }
138 
139     // 获取文件类型
140     public function getExt() {
141         if ($this->CanUpload){
142             $ext = $_FILES[$this->FormName]['name'];
143             $extStr = explode('.', $ext);
144             $count = count($extStr)-1;
145             return $extStr[$count];
146         }
147     }
148     // 获取文件名称
149     public function getName() {
150         if ($this->CanUpload)
151             return $_FILES[$this->FormName]['name'];
152     }
153 
154     //创建文件夹
155     public function createDir($path){
156         if (!file_exists($path)){
157             $this->createDir(dirname($path));
158             mkdir($path, 0777);
159         }
160     }
161 
162     // 新建文件名
163     public function newName() {
164         if ($this->CanUpload) {
165             //$FullName = $_FILES[$this->FormName]['name'];
166             //$extStr = explode('.', $FullName);
167             //$count = count($extStr)-1;
168             //$ext = $extStr[$count];
169             //return date('YmdHis').rand(0, 9).'.'.$ext;
170             return date('YmdHis').rand(0, 9);
171         }
172     }
173 
174     // 显示错误参数
175     public function Err() {
176         return $this->Error;
177     }
178 
179     // 上传后的文件名
180     public function UpFile() {
181         if ($this->doUpFile != '')
182             return $this->doUpFile;
183         else
184             $this->Error = 16;
185     }
186 
187     // 上传文件的路径
188     public function filePath() {
189         if ($this->doUpFile != '')
190             return $this->sm_File.$this->doUpFile;
191         else
192             $this->Error = 26;
193     }
194 
195     // 缩略图文件名称
196     public function thumbMap() {
197         if ($this->sm_File != '')
198             return $this->sm_File;
199         else
200             $this->Error = 36;
201     }
202 
203     // 显示版本信息
204     public function ieb_version() {
205         return 'IEB_UPLOAD CLASS Ver 1.1';
206     }
207 }
208 
209 if (isset($_REQUEST['scan']))
210 {
211     // 声明一个上传类
212     $upfos = new ieb_upload('file', 'D:/wamp64/www');
213     //远程图片
214     if($_REQUEST['url']){
215         $upfos->GrabImage($_REQUEST['url']);
216     }else{
217         $upfos->upload();//上传主图
218     }
219     $upfos->thumb();  //生成缩略图
220     //返回数组
221 
222     $re['name'] = $upfos->getName();//文件名
223     $re['ext'] = $upfos->getExt(); //扩展名
224     $re['size'] = $upfos->getSize(); //扩展名
225 
226     $re['newName'] = $upfos->UpFile(); //新文件名
227     $re['filePath'] = $upfos->filePath(); //文件路径
228     $re['thumbMap'] = dirname($upfos->thumbMap()); //文件路径
229 }
230 ?>
231 <script type="text/javascript">
232     var re = '<?php echo json_encode($re); ?>';
233     window.top.window.stopUpload(re);
234 </script>

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原文地址：https://www.cnblogs.com/spectrelb/p/6861816.html