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使用OSX系统，在使用MAMP Pro作为虚拟服务器，并使用PHP作为后端语言进行文件上传，从临时文件夹拷贝文件的方法为
move_uploaded_file
代码如下：
1 if($_FILES[‘file‘][‘error‘]>0){ 2 echo ‘file error‘; 3 }else{ 4 echo ‘upload:‘.$_FILES[‘file‘][‘name‘].‘<br>‘; 5 echo ‘type:‘.$_FILES[‘file‘][‘type‘].‘<br>‘; 6 echo ‘size:‘.$_FILES[‘file‘][‘size‘].‘<br>‘; 7 echo ‘stored in:‘.$_FILES[‘file‘][‘tmp_name‘].‘<br>‘; 8 if (file_exists("upload/" . $_FILES[‘file‘]["name"])) 9 { 10 echo $_FILES[‘file‘]["name"] . " already exists. "; 11 } 12 else 13 { 14 move_uploaded_file($_FILES[‘file‘]["tmp_name"], 15 "upload/" . $_FILES[‘file‘]["name"]); 16 echo "Stored in: " . "/Applications/MAMP/htdocs/learnPhp/upload/" . $_FILES[‘file‘]["name"]; 17 } 18 }
运行报错：
[23-Mar-2016 22:01:39] PHP Warning: move_uploaded_file(upload/visualize_pnas.py) [<a href=‘function.move-uploaded-file‘>function.move-uploaded-file</a>]: failed to open stream: Permission denied in /Applications/MAMP/htdocs/learnPhp/upload.php on line 18 [23-Mar-2016 22:01:39] PHP Warning: move_uploaded_file() [<a href=‘function.move-uploaded-file‘>function.move-uploaded-file</a>]: Unable to move ‘/Applications/MAMP/tmp/php/phpBeg1Al‘ to ‘upload/visualize_pnas.py‘ in /Applications/MAMP/htdocs/learnPhp/upload.php on line 18
主要报错为
failed to open stream: Permission denied
意思是，Php没有文件夹写权限，因为只有owner才有写权限。我们需要把这个文件夹的owner改为httpd的owner:
$ ps aux | grep httpd
结果为：
_www 68160 0.0 0.0 2487444 100 ?? S 10:10下午 0:00.00 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 68159 0.0 0.0 2487444 108 ?? S 10:10下午 0:00.01 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 68154 0.0 0.0 2487444 108 ?? S 10:10下午 0:00.03 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 66607 0.0 0.0 2487444 108 ?? S 8:34下午 0:00.09 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 66301 0.0 0.0 2487444 108 ?? S 8:15下午 0:00.06 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 66294 0.0 0.0 2487444 108 ?? S 8:15下午 0:00.04 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 66293 0.0 0.0 2487444 108 ?? S 8:15下午 0:00.06 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 66292 0.0 0.0 2487444 108 ?? S 8:15下午 0:09.47 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 66291 0.0 0.0 2487444 108 ?? S 8:15下午 0:07.27 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 66290 0.0 0.0 2487444 108 ?? S 8:15下午 0:00.08 /Applications/MAMP/Library/bin/httpd -f /Library/Application Support/appsolute/MAMP PRO/conf/httpd.conf -k start _www 66097 0.0 0.0 2472172 76 ?? S 8:15下午 0:00.00 /Applications/MAMP/Library/bin/
第一列为_www,所以，httpd的owner是_www。
接下来修改文件夹的owner:
$ sudo chown _www /Applications/MAMP/htdocs/learnPhp/upload/
这样就可以啦！我们现在验证一下：
看看这个文件夹的owner：
进入文件父目录：
$ cd /Applications/MAMP/htdocs/learnPhp/
查看子目录的owner:
$ ls -l
结果为：
drwxr-xr-x 3 Yellow admin 102 3 23 20:27 files -rw-r--r-- 1 Yellow admin 277 3 23 19:42 index.html drwxr-xr-x 4 _www admin 136 3 23 23:07 upload -rw-r--r-- 1 Yellow admin 792 3 24 10:50 upload.php -rw-r--r-- 1 Yellow admin 275 3 23 21:10 welcome.php
我们可以看到upload文件夹的owner已经是_www了，不过，之后要是用户常规操作修改文件夹的时候系统就提示需要输入管理员密码了。
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原文地址：http://www.cnblogs.com/nekoooo/p/5314797.html
