php man page for is_link

IS_LINK(3)								 1								IS_LINK(3)

is_link - Tells whether the filename is a symbolic link

SYNOPSIS
       bool is_link (string  $filename)

DESCRIPTION
	Tells whether the given file is a symbolic link.

PARAMETERS
	      o $filename
		- Path to the file.

RETURN VALUES
	Returns TRUE if the filename exists and is a symbolic link, FALSE otherwise.

EXAMPLES
       Example #1

	      Create and confirm if a file is a symbolic link

	      <?php
	      $link = 'uploads';

	      if (is_link($link)) {
		  echo(readlink($link));
	      } else {
		  symlink('uploads.php', $link);
	      }
	      ?>

ERRORS
/EXCEPTIONS
	Upon failure, an E_WARNING is emitted.

NOTES
       Note

	      The results of this function are cached. See clearstatcache(3) for more details.

       Tip

	      As  of  PHP  5.0.0,  this function can also be used with some URL wrappers. Refer to "Supported Protocols and Wrappers" to determine
	      which wrappers support stat(3) family of functionality.

SEE ALSO
       is_dir(3), is_file(3), readlink(3).

PHP Documentation Group 														IS_LINK(3)