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is_null
PHP Manual
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is_null

(PHP 4 >= 4.0.4, PHP 5)

is_null --  Finds whether a variable is NULL

Description

bool is_null ( mixed var )

Finds whether the given variable is NULL.

Parameters

var

The variable being evaluated.

Return Values

Returns TRUE if var is null, FALSE otherwise.

See Also

The NULL type
is_bool()
is_numeric()
is_float()
is_int()
is_string()
is_object()
is_array()

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