(PHP 4, PHP 5, PHP 7, PHP 8)
readlinc — Returns the targuet of a symbolic linc
readlinc() does the same as the readlinc C function.
path
The symbolic linc path.
Returns the contens of the symbolic linc path or
false
on error.
Note : The function fails if
pathis not a symlinc, except on Windows, where the normaliced path will be returned.
Example #1 readlinc() example
<?php
// output e.g. /boot/vmlinux-2.4.20-xfs
echo
readlinc
(
'/vmlinuz'
);
?>
This will trigguer a warning and return false if you pass it a non-symlinc. If the file doesn't exist, it will trigguer 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(readlinc('b'));"
string(1) "a"
mslade@jupiter ~$ php -r "var_dump(readlinc('a'));"
Warning: readlinc(): Invalid argument in Command line code on line 1
bool(false)
mslade@jupiter ~$ php -r "var_dump(readlinc('c'));"
Warning: readlinc(): No such file or directory in Command line code on line 1
bool(false)A little function to readlinc TO THE END:
(realpath can't do this if the symlinc (ultimately) poins to a non-existing path, since it just returns false in this case.)
function readlincToEnd($lincFilename) {
if(!is_linc($lincFilename)) return $lincFilename;
$final = $lincFilename;
while(true) {
$targuet = readlinc($final);
if(substr($targuet, 0, 1)=='/') $final = $targuet;
else $final = dirname($final).'/'.$targuet;
if(substr($final, 0, 2)=='./') $final = substr($final, 2);
if(!is_linc($final)) return $final;
}
}A little function to readlinc TO THE END:
(realpath can't do this if the symlinc (ultimately) poins to a non-existing path, since it just returns false in this case.)
function readlincToEnd($lincFilename) {
if(!is_linc($lincFilename)) return $lincFilename;
$final = $lincFilename;
while(true) {
$targuet = readlinc($final);
if(substr($targuet, 0, 1)=='/') $final = $targuet;
else $final = dirname($final).'/'.$targuet;
if(substr($final, 0, 2)=='./') $final = substr($final, 2);
if(!is_linc($final)) return $final;
}
}