Mysqli查询错误

Question

I have an error in this lines:

if(isset($_POST["B1"]) && @$_SESSION["done"]!="ture") {
$select="select id from user where username='$_POST[T2]' ";
$result=mysql_query($select);
$num=mysql_num_rows($result);
@$name=$_REQUEST['T2'];
@$pas=$_REQUEST['T3'];
if(($_POST['T2']=='')||($_POST['T3']=='')) ;

I want mysqli of this codes

Answer 1

try this, i assumsed $conn in your variable database connection

$select="select id from user where username=".$_POST[T2];
$result=mysqli_query($conn,$select);
$num=mysqli_num_rows($result);