2015年05月28日

PHP chmod 函数与批量修改文件目录权限

作者： 字体：[增加 减小] 类型：转载chmod() 函数改变文件模式。chmod — Changes file mode 如果成功则返回 TRUE，否则返回 FALSE。语法
chmod(file,mode)参数 描述
file 必需。规定要检查的文件。
mode 可选。规定新的权限。
mode 参数由 4 个数字组成：
第一个数字永远是 0
第二个数字规定所有者的权限
第二个数字规定所有者所属的用户组的权限
第四个数字规定其他所有人的权限
可能的值（如需设置多个权限，请对下面的数字进行总计）：
1 - 执行权限
2 - 写权限
4 - 读权限
来看个简单的实例
ta="20835" rel="nofollow" >复制代码代码如下:
<?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
?>

改进递归文件模式@ infosoft ....,这是一个小短，应处理的Linux文件系统的所有文件类型。这个可以批量更改文件或目录的权限
ta="12549" rel="nofollow" >复制代码代码如下:
<?php
function chmodr($path, $filemode) {
if (!is_dir($path))
return chmod($path, $filemode);
$dh = opendir($path);
while (($file = readdir($dh)) !== false) {
if($file != '.' && $file != '..') {
$fullpath = $path.'/'.$file;
if(is_link($fullpath))
return FALSE;
elseif(!is_dir($fullpath) && !chmod($fullpath, $filemode))
return FALSE;
elseif(!chmodr($fullpath, $filemode))
return FALSE;
}
}
closedir($dh);
if(chmod($path, $filemode))
return TRUE;
else
return FALSE;
}
?>

如果你目录太多的话可以用
ta="90523" rel="nofollow" >复制代码代码如下:
<?php
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($pathname), RecursiveIteratorIterator::SELF_FIRST);
foreach($iterator as $item) {
chmod($item, $filemode);
}
?>

这段代码来修改目录的权限
哈哈，我们不只是讲chmod简单语法，而且还做了复杂的关于chmod使用实例

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：

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”。
ta="30044" rel="nofollow" >复制代码代码如下:

<?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。

Note: 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。在大多数系统下文件模式只能被文件所有者的用户改变。

Note: 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。

Note: 当安全模式打开的时候，PHP 会检查所操作的文件是否和正在执行的脚本具有相同的 UID （所有者）。要注意的是，不能修改 SUID，SGID 和 sticky bits。
/************demo2*****************/做程序的开发，不得不遇到的就是文件权限的问题，很多时候我们程序出现的各种各样的问题也是因为文件权限的原因，尤其是在linux系统下更是如此，合理正确的分配文件的权限可以让程序更加的有效和安全，这里举个例子将一个目录遍历，并将其下所有文件权限改为777，对于文件的权限如何划分，大家可以google一下。先看代码ortant; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; background: transparent;" >ortant; line-height: 19.5px !important; font-weight: inherit !important; float: right !important; background: 0px 50%;" >ortant; font-weight: inherit !important; float: left !important; background-image: initial; background-attachment: initial; background-color: rgb(187, 187, 187) !important; background-size: initial; background-origin: initial; background-clip: initial; background-repeat: no-repeat;" >ortant; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important;" >ortant; font-weight: inherit !important; float: left !important; background-image: initial; background-attachment: initial; background-color: transparent !important; background-size: initial; background-origin: initial; background-clip: initial; background-repeat: no-repeat;" >ortant; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important;" >ortant; font-weight: inherit !important; float: left !important; background-image: initial; background-attachment: initial; background-color: rgb(187, 187, 187) !important; background-size: initial; background-origin: initial; background-clip: initial; background-repeat: no-repeat;" >ortant; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important;" >ortant; font-weight: inherit !important; float: left !important; background-image: initial; background-attachment: initial; background-color: transparent !important; background-size: initial; background-origin: initial; background-clip: initial; background-repeat: no-repeat;" >ortant; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important;" >ortant; font-weight: inherit !important; float: left !important; background-image: initial; background-attachment: initial; background-color: transparent !important; background-size: initial; background-origin: initial; background-clip: initial; background-repeat: no-repeat;" >ortant; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important;" >ortant; border: 0px; vertical-align: baseline; font-family: inherit; float: left; height: inherit; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; color: rgb(153, 153, 153) !important; background: transparent;" >PHPortant; padding: 0px !important; font-family: 'Courier New', monospace !important; height: auto !important; background: 0px 50%;" >ortant; background: 0px 50%;" >ortant; padding: 0px !important; margin-right: 0px !important; margin-bottom: 0px !important; margin-top: 0px !important; width: auto !important; border-spacing: 0px !important; border-collapse: collapse !important; overflow: hidden !important; background: none !important;" >ortant; border: none !important; vertical-align: top !important; margin: 0px !important; background: 0px 50%;" >

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background: transparent;" >;ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(128, 0, 128) !important; background: transparent;" >echoortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$pathortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >.ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 128, 0) !important; background: transparent;" >'<p>'ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >;ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(247, 247, 247) !important;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 78, 208) !important; background: transparent;" >recurDirortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >(ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$pathortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >)ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >;ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >}ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(247, 247, 247) !important;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >}ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(128, 0, 128) !important; background: transparent;" >elseortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >{ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$pathortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" >=ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$dirortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >.ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 128, 0) !important; background: transparent;" >'/'ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >.ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$fileortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >;ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(247, 247, 247) !important;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$chmodortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >?ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 78, 208) !important; background: transparent;" >chmodortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >(ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$pathortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >,ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$chmodortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >)ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" >:ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(128, 0, 128) !important; background: transparent;" >FALSEortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >;ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(128, 0, 128) !important; background: transparent;" >echoortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$pathortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >.ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 128, 0) !important; background: transparent;" >'<p>'ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >;ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(247, 247, 247) !important;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >}ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >}ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(247, 247, 247) !important;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >}ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 78, 208) !important; background: transparent;" >closedirortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >(ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 45, 122) !important; background: transparent;" >$handleortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >)ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >;ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(247, 247, 247) !important;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 111, 224) !important; background: transparent;" > ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >}ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >}ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(247, 247, 247) !important;" > ortant; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;" >ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 78, 208) !important; background: transparent;" >recurDirortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >(ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(0, 128, 0) !important; background: transparent;" >'ask'ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >,ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(206, 0, 0) !important; background: transparent;" >0777ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >)ortant; line-height: inherit !important; font-weight: inherit !important; color: rgb(51, 51, 51) !important; background: transparent;" >;

如上面代码，即是将本文件同级下的ask目录下的所有文件的权限改为777，但是并不包含ask这个目录，我们应该要来了解一下文件权限操作的常识，一个文件只能是改变其下级，或者同级的下级目录或文件的权限，而起同级的目录或文件，或者上级的目录或文件，其是不能改变的。原因是什么，就是出于安全的考虑，试想一下，如果下级可以改上级，那么我们岂不是可以控制整个电脑了，这样当然不安全。