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)
readlink
(PHP 4, PHP 5, PHP 7)
readlink — Returns the target of a symbolic link
설명
string readlink
( string
$path
)readlink() does the same as the readlink C function.
인수
-
path -
The symbolic link path.
변경점
| 버전 | 설명 |
|---|---|
| 5.3.0 | This function is now available on Windows platforms (Vista, Server 2008 or greater). |
반환값
Returns the contents of the symbolic link path or FALSE on error.
예제
Example #1 readlink() example
<?php
// output e.g. /boot/vmlinux-2.4.20-xfs
echo readlink('/vmlinuz');
?>
참고
- is_link() - Tells whether the filename is a symbolic link
- symlink() - Creates a symbolic link
- linkinfo() - Gets information about a link
add a note
User Contributed Notes 4 notes
MarkAndrewSlade at gmail dot com ¶
15 years ago
casinero dot triste at OH_NO_SPAM dot gmail dot com ¶
7 years ago
A little function to readlink TO THE END:
(realpath can't do this if the symlink (ultimately) points to a non-existing path, since it just returns false in this case.)
function readlinkToEnd($linkFilename) {
if(!is_link($linkFilename)) return $linkFilename;
$final = $linkFilename;
while(true) {
$target = readlink($final);
if(substr($target, 0, 1)=='/') $final = $target;
else $final = dirname($final).'/'.$target;
if(substr($final, 0, 2)=='./') $final = substr($final, 2);
if(!is_link($final)) return $final;
}
}
casinero dot triste at OH_NO_SPAM dot gmail dot com ¶
7 years ago
A little function to readlink TO THE END:
(realpath can't do this if the symlink (ultimately) points to a non-existing path, since it just returns false in this case.)
function readlinkToEnd($linkFilename) {
if(!is_link($linkFilename)) return $linkFilename;
$final = $linkFilename;
while(true) {
$target = readlink($final);
if(substr($target, 0, 1)=='/') $final = $target;
else $final = dirname($final).'/'.$target;
if(substr($final, 0, 2)=='./') $final = substr($final, 2);
if(!is_link($final)) return $final;
}
}
ayon at hyurl dot com ¶
7 years ago
It is neccesary to be notified that readlink only works for a real link file, if this link file locates to a directory, you cannot detect and read its contents, the is_link() function will always return false and readlink() will display a warning is you try to do. Like the following codes:
<?php
//assume that A is a directory located in C:, B is a symlink to A, and A contents a file named C.
echo is_link('B/C'); //false
echo readlink('B/C'); //false and a warning will be displayed
//instead, you should use realpath() function to get the real path of C
echo realpath('B/C'); //C:\A\C
?>
