readlink

(PHP 4, PHP 5)

readlink — 返回符号连接指向的目标

说明

string readlink ( string $path )

readlink() 和同名的 C 函数做同样的事，返回符号连接的内容。如果出错返回 FALSE。

Example #1 readlink() 例子


<?php

// output e.g. /boot/vmlinux-2.4.20-xfs
echo readlink('/vmlinuz');

?>

参见 is_link()，symlink() 和 linkinfo()。

参数

path: The symbolic link path.

更新日志

版本	说明
5.3.0	This function is now available on Windows platforms (Vista, Server 2008 or greater).

返回值

Returns the contents of the symbolic link path or FALSE on error.

范例

Example #2 readlink() example


<?php

// output e.g. /boot/vmlinux-2.4.20-xfs
echo readlink('/vmlinuz');

?>

参见

is_link() - 判断给定文件名是否为一个符号连接
symlink() - 建立符号连接
linkinfo() - 获取一个连接的信息

PHP手册 - N: 返回符号连接指向的目标

用户评论:

mookowg at gmail dot com (03-Dec-2010 12:36)

In case anyone was getting confused: This is NOT the coreutil "readlink". realpath("./path/of/file") is equivalent to readlink -e ./path/of/file which FYI i think is a terrible design choice choice, since the functionality of readline -f is hard to mimic, but readline -e is NOT

MarkAndrewSlade at gmail dot com (10-Jun-2009 08:35)

This will trigger a warning and return false if you pass it a non-symlink. If the file doesn't exist, it will trigger a differently worded warning. mslade@jupiter ~$ touch a mslade@jupiter ~$ ln -s a b mslade@jupiter ~$ ls -l {a,b} -rw------- 1 mslade mslade 0 2009-06-10 15:27 a lrwxrwxrwx 1 mslade mslade 1 2009-06-10 15:27 b -> a mslade@jupiter ~$ php -r "var_dump(readlink('b'));" string(1) "a" mslade@jupiter ~$ php -r "var_dump(readlink('a'));" Warning: readlink(): Invalid argument in Command line code on line 1 bool(false) mslade@jupiter ~$ php -r "var_dump(readlink('c'));" Warning: readlink(): No such file or directory in Command line code on line 1 bool(false)