   #PHP Manual Variable Functions is_long is_numeric

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                                    is_null

   (PHP 4 >= 4.0.4)
   is_null --  Finds whether a variable is NULL

Description

   bool is_null ( mixed var)

   Returns TRUE if var is null, FALSE otherwise.

   See the NULL type when a variable is considered to be NULL and when
   not.

   See also NULL, is_bool(), is_numeric(), is_float(), is_int(),
   is_string(), is_object(), is_array(), is_integer(), and is_real().
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