<?php session_start(); ?>
<!DOCTYPE html>
<!--
session ID 
1) nepouzivame-li cookies 
SID="session name = session ID" stranka.php<?php echo SID ?>
2) pouzivame-li cookies, SID="", ID se predava v cookies, session start je povinne na zacatku

session name je PHPSESSID - nastavitelne v php.ini
-->
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <form action="4-first.php" method="GET">
            Jmeno: <input type="text" name="txtJmeno"><br><br>
            <input type="submit" name="btnSubmit" value="Uloz jmeno"> <!-- ulozeni do pole session -->
            <br>
            <a href="4-second.php">Druha stranka</a>
        </form>
        <?php
        if(!empty($_GET["btnSubmit"]))
        {    
            $_SESSION["jmeno"]=$_GET["txtJmeno"];
            $_SESSION["poleJmen"][]=$_GET["txtJmeno"];
        }
        $_SESSION["cislo"] = 10;
        var_dump($_SESSION);
        
        ?>
    </body>
</html>
