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class db {
function selectOne($tablename, $fieldname, $value) {
......
}
}
class user {
function checkReg($username) {
$db->selectOne('users', 'username', $username);
.....
}
}
class user {
private $db;
function user(&$db){
$this->db = $db;
}
function checkReg($username) {
$this->db->selectOne('users', 'username', $username);
.....
}
}
$db = new db();
$user = new user($db);
$db = new db();
$db -> selectOne('users', 'username', $username);