Database에서 php값을 가져다 쓰는법을 잘 모르겠습니다.

<?php
$n1 = $_POST['email'];
$n2 = $_POST['phone'];
 
$n1 = 'abc';
$n2 = '123';
 
 
echo "-----------------------------<BR>";
echo "new mysqli() 로 사용하는 방법<BR>";
 
$mysqli = new mysqli('localhost','root','apmsetup','Naul');
if (mysqli_connect_errno()) 
{
  printf("Connection failed: %s\n", mysqli_connect_error());
  exit();
}
 
$query = "select * from list where email = 'abc @naver.com' and phone = 'abc'"; 
$SQL = $query;
if ( ($result = $mysqli->query($SQL))===false )
{
  printf("Invalid query: %s\nWhole query: %s\n", $mysqli->error, $SQL);
  exit();
}
 
while ($myrow = $result->fetch_array(MYSQLI_ASSOC))
{
echo $myrow["id"] . "<BR>";
echo $myrow["pw"] . "<BR>";
echo $myrow["email"] . "<BR>";
echo $myrow["phone"] . "<BR>";
echo "<BR>";
}
$result->close();
$mysqli->close();
 
 
 
echo "-----------------------------<BR>";
echo "mysql_select_db 로 사용하는 방법<BR>";
 
$conn = mysql_connect('localhost','root','apmsetup');
$db_status = mysql_select_db('Naul');
if(!$db_status)
{
	error("DB_ERROR");
	exit;
}
 
$query = "select * from list where email = 'abc @naver.com' and phone = 'abc'"; 
 
$result = mysql_query($query); 
$num = mysql_num_rows($result); 
$row = mysql_fetch_assoc($result); 
$id = $row['id']; 
 
echo $row['id'] . "<BR>";
echo $row['pw'] . "<BR>";
echo $row['email'] . "<BR>";
echo $row['phone'] . "<BR>";
mysql_close($conn);
 
 
?>