doubt in code related sessions in php

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Iam abeginner in php coding.i have doubt in 12 to 19 lines in arraysession.php.when form is submited,$POST['form_products] is checked wheter it is defined.then $_SESSION['products']is cheked whether it is empty but condition not satisgfied,but in the book they gave condition is satisfied.can u please clarify me how .why they have used serialize and unserialize.i have taken this code for "sams teach ur self php".please help me to understand this code

arraysession.php

PHP

1: <?php
2: session_start();
3: ?>
4: <!DOCTYPE html>
5: <html>
6: <head>
7: <title>Storing an array with a session</title>
8: </head>
9: <body>
10: <h1>Product Choice Page</h1>
11: <?php
12: if (isset($_POST[‘form_products’])) {
13: if (!empty($_SESSION[‘products’])) {
14: $products = array_unique(
15: array_merge(unserialize($_SESSION[‘products’]),
16: $_POST[‘form_products’]));
17: $_SESSION[‘products’] = serialize($products);
18: } else {
19: $_SESSION[‘products’] = serialize($_POST[‘form_products’]);
20: }
21: echo "<p>Your products have been registered!</p>";
22: }
23: ?>
24: <form method="post" action="<?php echo $_SERVER[‘PHP_SELF’]; ??>">
25: <p><label for="form_products">Select some products:</label><br />
26: <select id="form_products" name="form_products[]" multiple="multiple"
size="3">
27: <option value="Sonic Screwdriver">Sonic Screwdriver</option>
28: <option value="Hal 2000">Hal 2000</option>
29: <option value="Tardis">Tardis</option>
30: <option value="ORAC">ORAC</option>
31: <option value="Transporter bracelet">Transporter bracelet</option>
32: </select></p>
33: <button type="submit" name="submit" value="choose">Submit Form</button>
34: </form>
35: <p><a href=""session1.php"">go to content page</a></p>
36: </body>
37: </html>

session6.php

PHP

1: <?php
2: session_start();
3: ?>
4: <!DOCTYPE html>
5: <html>
6: <head>
7: <title>Accessing session variables</title>
8: </head>
9: <body>
10: <h1>Content Page</h1>
11: <?php
12: if (isset($_SESSION[‘products’])) {
13: echo "<strong>Your cart:</strong><ol>";
14: foreach (unserialize($_SESSION[‘products]) as $p) {
15: echo "<li>".$p."</li>;
16: }
17: echo "</ol>";
18: }
19: ?>
20: <p><a href=""arraysession.php"">return to product choice page</a></p>

NOTE
www.it-

[Edit]Code blocks added[/Edit]

Posted 23-Feb-13 0:02am

Member 9858040

Updated 23-Feb-13 0:15am

Thomas Daniels

v2

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A. S. M. Abdur Rab · Answer 1 · 2013-03-04T00:03:00

I have removed the extra "?" from the below code at line 24:

PHP

<?php echo $_SERVER[‘PHP_SELF’]; ???> should be <?php echo $_SERVER[‘PHP_SELF’]; ??>

Now, the code seems to be ok.

In PHP, serialize() function is used to generates a storable representation of a value.
http://php.net/manual/en/function.serialize.php[^]

In PHP, unserialize() function is used to create a PHP value from a stored representation
http://php.net/manual/en/function.unserialize.php[^]