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Conexão com Mysqli


XandyW

Question

Olá,

sempre fiz minhas conexões pelo método convencional (mysql_connect, mysql_select_db).

Estou lendo um pouco sobre o mysqli.

Gostaria de saber a diferença entre:

class Classe extends mysqli
{

function __construct()
{
$conn = mysqli_connect();
}

}

class Classe{

function __construct()
{
 $conn = new mysqli(HOST,USER,SENHA,DB);
}

}

Existe alguma diferença? Um deles é melhor que o outro?

Outra pergunta: caso eu fechar a conexão no __destruct ela fecha assim que carregar a página por completo?

Obrigado

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