php / "Красота кода"

$mq = mysql_connect("localhost", "user", "pass");
mysql_select_db("name_db");
$str = "username=vasya; userpass=1234; age=34";
$ex = explode("; ", $str);
foreach ($ex as $exp) {
$expl = explode("=", $exp);
    if ($expl[0]=="username") { $username = $expl[1];}
    if ($expl[0]=="userpass") { $userpass = $expl[1];}
           if ($expl[0]=="age") { $age = $expl[1];}
    }
$sql = "SELECT username FROM `name_db` WHERE username='$username'";
$result = mysql_query($sql);
for ($data=array(); $row = mysql_fetch_assoc($result); $data[]=$row);

if (!isset($data['username'])){
    $sql_i = "INSERT INTO `name_db` VALUES ('$username', '$userpass', '$age')";
    $result_i = mysql_query($sql_i);
} else {
    $sql_u = "UPDATE `name_db` SET userpass='$userpass', age='$age' WHERE username='$username'";
    $result_u = mysql_query($sql_u);
}