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PHP: Handbuch
PHP Handbuch der PHP-Dokumentationsgruppe php.netis_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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