realpath() expands all symbolic links and resolves references to '/./', '/../' and extra '/' characters in the input path
and returns the canonicalized absolute pathname.
The path being checked.
Note:
Whilst a path must be supplied, the value can be blank or
NULL
In these cases, the value is interpreted as the current directory.
Returns the canonicalized absolute pathname on success. The resulting path will have no symbolic link, '/./' or '/../' components. Trailing delimiters, such as \ and /, are also removed.
realpath() returns FALSE
on failure, e.g. if the file does not exist.
Note:
The running script must have executable permissions on all directories in the hierarchy, otherwise realpath() will return
FALSE
.
Note:
For case-insensitive filesystems realpath() may or may not normalize the character case.
Note: Because PHP's integer type is signed and many platforms use 32bit integers, some filesystem functions may return unexpected results for files which are larger than 2GB.
Prior to this release, if only the last path
component did not exist, realpath() would not fail on *BSD systems. realpath() now fails in this case.
Prior to this version, realpath() returned FALSE
if path
is an empty string or NULL
.
<?php chdir('/var/www/'); echo realpath('./../../etc/passwd') . PHP_EOL; echo realpath('/tmp/') . PHP_EOL; ?>
The above example will output:
/etc/passwd /tmp
On windows realpath() will change unix style paths to windows style.
<?php echo realpath('/windows/system32'); echo realpath('C:\Program Files\\'); ?>
The above example will output:
C:\WINDOWS\System32 C:\Program Files
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