超越PHP - Exceed PHP: chmod

说明

bool chmod ( string filename, int mode)

尝试将 filename 所指定文件的模式改成 mode 所给定的。

注意 mode 不会被自动当成八进制数值，而且也不能用字符串（例如 "g+w"）。要确保正确操作，需要给 mode 前面加上 0：


<?php

chmod ("/somedir/somefile", 755);   // 十进制数，可能不对

chmod ("/somedir/somefile", "u+rwx,go+rx"); // 字符串，不对

chmod ("/somedir/somefile", 0755);  // 八进制数，正确的 mode 值

?>

mode 参数包含三个八进制数按顺序分别指定了所有者、所有者所在的组以及所有人的访问限制。每一部分都可以通过加入所需的权限来计算出所要的权限。数字 1 表示使文件可执行，数字 2 表示使文件可写，数字 4 表示使文件可读。加入这些数字来制定所需要的权限。有关 UNIX 系统的文件权限可以阅读手册“man 1 chmod”和“man 2 chmod”。


<?php

// Read and write for owner, nothing for everybody else

chmod ("/somedir/somefile", 0600);



// Read and write for owner, read for everybody else

chmod ("/somedir/somefile", 0644);



// Everything for owner, read and execute for others

chmod ("/somedir/somefile", 0755);



// Everything for owner, read and execute for owner's group

chmod ("/somedir/somefile", 0750);

?>

如果成功则返回 TRUE，失败则返回 FALSE。

注: 当前用户指的是执行 PHP 的用户。很可能和通常的 shell 或者 FTP 用户不是同一个。

注: 本函数不能作用于远程文件，被检查的文件必须通过服务器的文件系统访问。

参见 chown() 和 chgrp()。

add a note User Contributed Notes
chmod

gnettles2 at home dot com
25-Aug-2001 02:20

Usually when you're trying to write to af file, you'll need to chmod the
file to something like 666 or 755. You can use a command to chmod the file
for you, which is especially useful when you're making a script where
you're setting it up so that your users don't have to peform a bunch of
actions to setup the script. When i wrote my news program script, I only
had two files. install.php and config.php. All you had to do was chmod
install.php to 666 and open it up in a web browser and answer a few
questions. The script itself setup the rest of the files and chmodded them
for you.

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