Get session array from different file - php

Question

I can't access array from other file and still don't figure it out, whether my data already stored into array or not. Should i put $_SESSION into the function?
Lat3_3a.php
<form id="form1" name="form1" method="post" action="Lat3_3b.php">
Insert number: <input type="number" name="num" id="num" />
<input type="submit" name="button" id="button" value="OK" />
</form>
Lat3_3b.php
<?php
session_start();
$_SESSION["num"] = $_POST["num"];
if (empty($_SESSION["num"]))
echo "Please, insert number";
else {
$val=$_POST['num'];
echo " Factorial " .$val. " ! = " .factorial($val)."<br/>";
echo "<a href='Lat3_3c.php'>Link</a>";
}
function factorial($val){
if($val<=1){
$result=1;
return $result;
}elseif($val>1){
for($i=1; $i<=$val; $i++){
$result=$val * factorial($val-1);
}
return $result;
}
$data=array($val,$result,"12345", "Travis");
$_SESSION["var"]=$_POST["data"];
}
?>
Lat3_3c.php
<?php
session_start();
if(empty($_SESSION["var"]))
echo "Variable not found";
else
echo "Data : ". $_SESSION["var"];
?>

Answer 1

Ok looking a bit more in to your code, you need to learn more about the session, post and functions. For that a look at the PHP manual site.
Site http://php.net
For your code to work you need to use something like this:
<?php
session_start();
$_SESSION["num"] = $_POST["num"];
$_SESSION["var"]=array();
if (empty($_SESSION["num"])){
echo "Please, insert number";
}
else {
$val=$_POST['num'];
$function_result=factorial($val);
$data=array($val,$function_result,"12345","Travis");
$_SESSION["var"]=$data;
echo " Factorial " .$val. " ! = " .$function_result."<br/>";
echo "<a href='Lat3_3c.php'>Link</a>";
}
function factorial($val){
if($val<=1){
$result=1;
return $result;
}elseif($val>1){
for($i=1; $i<=$val; $i++){
$result=$val * factorial($val-1);
}
return $result;
}
}
?>
I'm not looking into your math.