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Tipos
PHP Manual

NULL

O valor especial NULL representa que a variável não tem valor. NULL é o único valor possível do tipo NULL.

Nota: O tipo NULL foi incluído no PHP 4.

A variável é considerada null se:

Sintaxe

Há apenas um único valor do tipo null, e é a palavra-chave case-insensitive NULL.

<?php
$var 
NULL;
?>

Veja também as funções is_null() e unset().

Convertendo para NULL

Convertendo uma variável para null removerá a variável e apagar seu valor.


Tipos
PHP Manual

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