Performs a bitwise AND operation between two variants

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variant_and ( mixed $left , mixed $right ) : mixed

Performs a bitwise AND operation. Note that this is slightly different from a regular AND operation.

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left: The left operand.
right: The right operand.

Note:
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**Variant AND Rules**
If `left` is	If `right` is	then the result is
`TRUE`	`TRUE`	`TRUE`
`TRUE`	`FALSE`	`FALSE`
`TRUE`	`NULL`	`NULL`
`FALSE`	`TRUE`	`FALSE`
`FALSE`	`FALSE`	`FALSE`
`FALSE`	`NULL`	`FALSE`
`NULL`	`TRUE`	`NULL`
`NULL`	`FALSE`	`FALSE`
`NULL`	`NULL`	`NULL`

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variant_or() - Performs a logical disjunction on two variants

variant_and

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