(PHP 4, PHP 5, PHP 7, PHP 8)
basename — Returns trailing name component of path
$path, string $suffix = ""): stringGiven a string containing the path to a file or directory, this function will return the trailing name component.
Note:
basename() operates naively on the input string, and is not aware of the actual filesystem, or path components such as "
..".
    basename() is locale aware, so for it to see the 
    correct basename with multibyte character paths, the matching locale must 
    be set using the setlocale() function.
    If path contains characters which are invalid for the
    current locale, the behavior of basename() is undefined.
   
pathA path.
       On Windows, both slash (/) and backslash
       (\) are used as directory separator character. In
       other environments, it is the forward slash (/).
      
suffix
       If the name component ends in suffix this will also
       be cut off.
      
   Returns the base name of the given path.
  
Example #1 basename() example
<?php
echo "1) ".basename("/etc/sudoers.d", ".d").PHP_EOL;
echo "2) ".basename("/etc/sudoers.d").PHP_EOL;
echo "3) ".basename("/etc/passwd").PHP_EOL;
echo "4) ".basename("/etc/").PHP_EOL;
echo "5) ".basename(".").PHP_EOL;
echo "6) ".basename("/");
?>
The above example will output:
1) sudoers 2) sudoers.d 3) passwd 4) etc 5) . 6)