php文件上传(普通上传与异步上传)的例子

2，upload_file.php

2. //php普通文件上传
3. //by bbs.it-home.org
4. if ((($_FILES["file"]["type"] == "image/gif")|| ($_FILES["file"]["type"] == "image/jpeg")|| ($_FILES["file"]["type"] == "image/pjpeg"))&& ($_FILES["file"]["size"] < 20000)){
5. if ($_FILES["file"]["error"] > 0) {
6. echo "Return Code: " . $_FILES["file"]["error"] . "
   ";
7. }else {
8. echo "Upload: " . $_FILES["file"]["name"] . "
   ";
9. echo "Type: " . $_FILES["file"]["type"] . "
   ";
10. echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb
    ";
11. echo "Temp file: " . $_FILES["file"]["tmp_name"] . "
    ";
13. if (file_exists("upload/" . $_FILES["file"]["name"])){
14. echo $_FILES["file"]["name"] . " already exists. ";
15. }else{
16. move_uploaded_file($_FILES["file"]["tmp_name"],
17. "upload/" . $_FILES["file"]["name"]);
18. echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
19. }
20. }
22. }else {
23. echo "Invalid file";
24. }
25. ?>

二、异步文件上传 使用iframe异步上传文件。 1，前端html

2，Js代码

2. function startUpload() {
3. var spanObj = document.getElementById("info");
4. spanObj.innerHTML = " 开始上传";
5. document.getElementById("upForm").sumbit();
6. }
7. //回调
8. function stopUpload(responseText){
9. var spanObj = document.getElementById("info");
10. spanObj.innerHTML = "上传成功";
11. spanObj.innerHTML = responseText;
12. }

2）、服务器端代码

3. <?php

4. $file = $_FILES['myfile'];
5. $fileName = uploadFile($file);
6. //$result = readFromFile("../upload/" . $fileName);
7. echo "";
9. function uploadFile($file) {
10. // 上传路径
11. $destinationPath = "../upload/";
12. if (!file_exists($destinationPath)){
13. mkdir($destinationPath , 0777);
14. }
15. //重命名
16. $fileName = date('YmdHis') . '_' . iconv('utf-8' , 'gb2312' , basename($file['name']));
17. if (move_uploaded_file($file['tmp_name'], $destinationPath . $fileName)) {
18. return iconv('gb2312' , 'utf-8' , $fileName);
19. }
20. return '';
21. }

22. //代码注释

23. /*
24. 1，关于basename方法
25. $path = "/testweb/home.php";
26. //显示带有文件扩展名的文件名
27. echo basename($path);
28. //显示不带有文件扩展名的文件名
29. echo basename($path,".php");
31. 2，关于iconv
32. iconv('gb2312' , 'utf-8' , $fileName);//将$fileName从gb2312转为utf-8格式。
33. 注：该函数需要开启php.ini里面的php_iconv.dll
35. 3，关于$_FILES['myfile']
36. $_FILES相当于一个二维数组，而$_FILES['myfile']相当于一个一维数组。所以可以
37. $f = $_FILES['myfile'];
38. echo $f['name'];
40. 如果直接访问该$_FILES['myfile']，则会报Undefined index: myfile。此时加上
41. if(!isset($_FILES['myfile'])){
42. die('上传文件不存在！');
43. }
44. */