How to pass two array over session and combine them to display - php

Question

I am trying to send two array over session and then combined them to display together but nothing displayed.This is my code--->
<?php
session_start();
function tee($uid){
include 'connect.php';
$uid=$uid;
$parent=array();
$child=array();
$_SESSION["child"]=array();
$_SESSION["parent"]=array();
$sql="select id from relation2 where parentID=$uid";
$result=mysql_query($sql,$link);
while($row=mysql_fetch_assoc($result))
{
$parent[]=$uid;
$child[]=$row["id"];
$_SESSION["child"][]=$child;
$_SESSION["parent"][]=$parent;
tee($row["id"]);
}
}
tee(2);
foreach(array_combine($_SESSION["child"],$_SESSION["parent"]) as $child=>$parent)
{
echo $child.'----------->'.$parent;
echo '<br>';
}
?>

Answer 1

I replaced the the query output with something custom and this code worked for me
<?php
session_start();
function tee($uid){
include 'connect.php';
$parent=array();
$child=array();
$_SESSION["child"]=array();
$_SESSION["parent"]=array();
$sql="select id from relation2 where parentID=$uid";
$result=mysqli_query($sql,$link);
while($row=mysqli_fetch_assoc($result))
{
$_SESSION["child"][]=$row["id"];
$_SESSION["parent"][]=$uid;
}
tee(2);
foreach(array_combine($_SESSION["child"],$_SESSION["parent"]) as $child=>$parent)
{
echo $child.'----------->'.$parent;
echo '<br>';
}
?>
Also check the extract() function
If you pass $uid from user input use PDO