realpath
(PHP 4, PHP 5)
realpath — Returns canonicalized absolute pathname
說明
string realpath
( string $path
)
realpath() expands all symbolic links and resolves references to '/./', '/../' and extra '/' characters in the input path . and return the canonicalized absolute pathname.
參數
- path
-
The path being checked.
Return值
Returns the canonicalized absolute pathname on success. The resulting path will have no symbolic link, '/./' or '/../' components.
realpath() returns FALSE on failure, e.g. if the file does not exist. On BSD systems realpath() doesn't fail if only the last path component doesn't exist, while other systems will return FALSE.
範例
Example#1 realpath() example
<?php
chdir('/var/www/');
echo realpath('./../../etc/passwd');
?>
上例將輸出:
/etc/passwd