文件上传

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php实现简单文件上传，代码如下：

1、upload.html

<html><head> <title>Adinistration - upload new files</title></head><body><h1>Upload new news files</h1><form action="upload.php" method="post" enctype="multipart/form-data"><div> <input type="hidden" name="MAX_FILE_SIZE" value="1000000"><label for="userfile">Upload a file:</label><input type="file" name="userfile" id="userfile" /><input type="submit" value="Send file" /></div></form></body></html>

2、处理页:upload.php

<html><head><title>Uploading...</title></head><body><h1>Uploading file...</h1><?phpif($_FILES['userfile']['error']>0){echo 'Problem:';switch($_FILES['userfile']['error']){case 1:echo 'File excedded upload_max_filesize'; break;case 2:echo 'File exceeded max_file_size'; break; case 3:echo 'File only partially uploaded'; break; case 4:echo 'No file uploaded'; break; case 6:echo 'Cannot upload file:No temp directory specified'; break;case 7:echo 'Upload failed:Cannot write to disk'; break; }exit;}// Does the file have the right MIME type?if($_FILES['userfile']['type']!='text/plain'){echo 'Problem: file is not plain text';exit;}//echo '$_FILES["userfile"]["tmp_name"]：'.$_FILES['userfile']['tmp_name'].'<br />';// put the file where we'd like it$upfile='D:/usr_temp/php/uploads/'.$_FILES['userfile']['name']; echo '$upfile:'.$upfile."<br />";if(is_uploaded_file($_FILES['userfile']['tmp_name'])){if(!move_uploaded_file($_FILES['userfile']['tmp_name'],$upfile)){echo 'Problem: Could not move file to desination directory';exit;}}else{echo 'Problem : Possible file upload attack. Filename:';echo $_FILES['userfile']['name'];exit;}echo 'File uploaded successfully<br><br>';// remove possible HTML and PHP tags from the file's contents$contents=file_get_contents($upfile);$contents=strip_tags($contents);file_put_contents($_FILES['userfile']['name'],$contents);// show what was uploadedecho '<p>Preview of uploaded file contents:<br/><hr/>';echo nl2br($contents);echo '<br/><hr/>';?></body></html>