Pesquisas recentes:
language functions ,
include functions ,
variable functions ,
post functions
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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:
ela foi assimilada com a constante NULL.
ela ainda não recebeu nenhum valor ainda.
ela foi apagada com unset().
Há apenas um único valor do tipo null, e é a palavra-chave case-insensitive NULL.
<?php
$var = NULL;
?>
Convertendo uma variável para null removerá a variável e apagar seu valor.
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