Issue with $_SESSION - php

Question

I am creating a page that would allow the user to select an existing address, or input a new one, here are my codes.
<table cellpadding="10px">
<tr>
<td><input type="radio" id="huhu" name="huhu" value="<?php echo $_SESSION['home_address']; ?>"></td><td><?php echo $_SESSION['home_address']; ?></td>
</tr>
<tr>
<td><input type="radio" id="huhu" name="huhu" value="New"></td><td><input type="text" placeholder="New Address" id="newAdd" name="newAdd" disabled></td>
</tr>
</table>
and here are my codes at the next page.
<?php
if(isset($_POST['newAdd'])){
$_SESSION['home_address'] = $_POST['newAdd'];
echo $_POST['newAdd']."<br>";
}
else{
$_SESSION['home_address'];
}
echo $_SESSION['home_address'];
?>
When i click on the existing address, it just deletes it. and does not store anything. but when i input a new on in the text area. it works.
I need to make it so that when the user clicks the address, the same address from the existing session displays.
please help. thank you.

Answer 1

I think you have missed session_start() method in your PHP file. Try to add the following code at the beginning of PHP file
if (!isset($_SESSION))session_start();

Answer 2

if your session info is correctly set.. this should work out.
<?php
session_start();
// for my testing....
$_SESSION['home_address'] = 'curr_session_address';
var_dump($_POST);
var_dump($_SESSION);
$s_addr = isset($_SESSION['home_address']) ? $_SESSION['home_address'] : '';
$p_addr = isset($_POST['newAdd']) ? $_POST['newAdd'] : '';
if ( !empty($p_addr) ) {
$_SESSION['home_address'] = $p_addr;
echo "new_address = $p_addr<br>";
}
else {
echo "session_address = $s_addr<br>";
}
?>
<form method='post' action='?'>
<table cellpadding="10px">
<tr>
<td><input type="radio" id="huhu" name="huhu" value="<?php echo $_SESSION['home_address']; ?>"></td>
<td><?php echo $_SESSION['home_address']; ?></td>
</tr>
<tr>
<td><input type="radio" id="huhu" name="huhu" value="New"></td>
<td><input type="text" placeholder="New Address" id="newAdd" name="newAdd"></td>
</tr>
</table>
<input type='submit' value='submit'>
</form>

Answer 3

Try this one.
if(empty($_POST['newAdd'])){
$_SESSION['home_address'] = $_POST['huhu'];
}
else if(!empty($_POST['newAdd'])){
$_SESSION['home_address'] = $_POST['newAdd'];
}
and i suggest that you dont use $_SESSION in your radio button page. it leads to complications and it will always be over written.