php man page for is_file

IS_FILE(3)								 1								IS_FILE(3)

is_file - Tells whether the filename is a regular file

SYNOPSIS
       bool is_file (string  $filename)

DESCRIPTION
	Tells whether the given file is a regular file.

PARAMETERS
	      o $filename
		- Path to the file.

RETURN VALUES
	Returns TRUE if the filename exists and is a regular file, FALSE otherwise.

       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.

EXAMPLES
       Example #1

	      is_file(3) example

	      <?php
	      var_dump(is_file('a_file.txt')) . "
";
	      var_dump(is_file('/usr/bin/')) . "
";
	      ?>

	      The above example will output:

	      bool(true)
	      bool(false)

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_link(3).

PHP Documentation Group 														IS_FILE(3)