This doesn't know what's wrong. 7, 8 lines error

This does not know where the wrong 7, 8 lines error
Include ("includes/config.php");
7th, 8 line error
Lei (0);
$ii = 0;
function lei ($belongs _id) {
$sql =mysql_query ("select * from Pro_type where belongs_id= '". $belongs _id. "'", $conn);
while ($rs _info=mysql_fetch_array ($sql)) {
Big class
if ($belongs _id==0) {
echo "Big class";
}else{
echo "Small class";
}
$ii = $ii +1;
Lei ($rs _info["id"]);
$ii = $ii-1;
}
}
?>

------Solution--------------------
The discovery is a variable scope problem. The variables in the function are local variables, and $conn to use global variables, you have to declare
------Solution--------------------

PHP Code

  
   
------Solution--------------------
To
Global $conn;
$sql =mysql_query ("select * from Pro_type where belongs_id= '". $belongs _id. "'", $conn);
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