php开发之文件上传
1,配置php.ini文件
主要对下面几个属性值进行设置:
2,预定义变量
列表如下:
创建一个上传域,通过_FILES变量输出上传文件的资料。示例代码如下:
<form action="" enctype="multipart/form-data" method="post" name="uploadfile">上传文件:<input type="file" name="upfile" /><br> <input type="submit" value="上传" /></form> <?php if (is_uploaded_file($_FILES['upfile']['tmp_name'])) { $upfile =$_FILES["upfile"]; foreach ($upfile as $value) { echo $value."<br>"; } } ?>
运行结果如下:
3,文件上传函数
php中使用move_uploaded_file()函数上传文件,语法如下:
bool move_uploaded_file(string filename,string destination)
该函数将文件上传到指定的位置,如果成功则返回true,失败则返回false。参数filename,事临时文件名,即$_FILE[tmp_name];参数destination是上传后保存的新的路径和名称。
示例代码如下:
<form action="" enctype="multipart/form-data" method="post" name="uploadfile">上传文件:<input type="file" name="upfile" /><br> <input type="submit" value="上传" /></form> <?php if (is_uploaded_file($_FILES['upfile']['tmp_name'])) { $upfile =$_FILES["upfile"]; if (move_uploaded_file($upfile['tmp_name'], $upfile['name'])) { echo "上传成功"; }else{ echo "上传失败"; }}?>
运行结果如下:
4,多文件上传
多文件上传有多种方法,下面我们根据单文件上传来演化出一种多文件上传。代码示例如下:
<form action="index.php" enctype="multipart/form-data" method="post" name="uploadfile">上传文件:<br> <input type="file" name="upfile1" /><br> <input type="file" name="upfile2" /><br> <input type="file" name="upfile3" /><br> <input type="submit" value="上传" /><br> </form> <?php // header('Content-Type:text/html;charset=utf-8'); $file1 =$_FILES['upfile1']; $file2 =$_FILES['upfile2']; $file3 =$_FILES['upfile3']; if ($file1['error'] == UPLOAD_ERR_OK){ echo "路径:".$file1['name']."<br>"; if (move_uploaded_file($file1['tmp_name'], $file1['name'])) { echo "上传成功<br>"; }else{ echo "上传失败<br>"; } } if ($file2['error'] == UPLOAD_ERR_OK){ echo "路径:".$file2['name']."<br>"; if (move_uploaded_file($file2['tmp_name'], $file2['name'])) { echo "上传成功<br>"; }else{ echo "上传失败<br>"; } } if ($file3['error'] == UPLOAD_ERR_OK){ echo "路径:".$file3['name']."<br>"; if (move_uploaded_file($file3['tmp_name'], $file3['name'])) { echo "上传成功<br>"; }else{ echo "上传失败<br>"; } } ?>
运行结果如下:
第二种多文件上传的方式的示例代码如下:
<form action="index.php" enctype="multipart/form-data" method="post" name="uploadfile">上传文件:<br> <input type="file" name="upfile[]" /><br><input type="file" name="upfile[]" /><br><input type="file" name="upfile[]" /><br><input type="submit" value="上传" /><br> </form> <?php // header('Content-Type:text/html;charset=utf-8'); $filearray =$_FILES['upfile']; print_r($filearray); foreach ($filearray['error'] as $key =>$error) { if ($error==UPLOAD_ERR_OK) { echo "文件名:".$filearray['name'][$key]."<br>"; if (move_uploaded_file($filearray['tmp_name'][$key], $filearray['name'][$key])) { echo "上传成功<br>"; }else{ echo "上传失败<br>"; } } } ?>
运行结果如下:
除了上面的两种,还有第三种多个文件上传的方式,当然也是我觉得最完美的方式,就是可以一次选择多个文件进行上传。主要就是利用swfupload 来实现。由于我目前的知识有限,会在后面和大家共同学习这个。

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