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POI can't get a value to stay in my $_SESSION variable
 

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    <p>I am trying to get values out of an indexed array, but when I use a variable as the index (which is equal to an index in the array), it does not appear. I get an <code>Undefined Index</code> Error. Why is this happening? Does anyone know? Thanks!</p> <p>I have the following code:</p> <pre><code>$bookarray = array(); $books = mysqli_query($db, "SELECT * FROM books"); while($row = mysqli_fetch_assoc($books)){ $bookarray[$row['bookID']] = array( 'title' =&gt; $row['title'], 'author' =&gt; $row['author'], 'price' =&gt; $row['price'] ); } echo"&lt;hr&gt;"; print_r($bookarray); echo"&lt;hr&gt;"; echo $bookarray[5]['title']."&lt;br /&gt;"; foreach($_SESSION['cart'] as $cartedbook){ echo $cartedbook; echo $bookarray[$cartedbook]['title']; echo "&lt;br /&gt;"; } </code></pre> <p>This is the output:</p> <p><h3>Books</h3><hr></p> <pre><code>Array ( [1] =&gt; Array ( [title] =&gt; Java 2 for Pro Deelopers [author] =&gt; Michael Morgan [price] =&gt; 34.99 ) [2] =&gt; Array ( [title] =&gt; Installing XAMPP [author] =&gt; Thomas Down [price] =&gt; 24.99 ) [3] =&gt; Array ( [title] =&gt; Alice Through the Looking Glass [author] =&gt; Louis Carroll [price] =&gt; 72.35 ) [4] =&gt; Array ( [title] =&gt; Quantum Mechanics in 124 Hours [author] =&gt; Neils Bohr [price] =&gt; 24.99 ) [5] =&gt; Array ( [title] =&gt; PHP For Fun And Profit [author] =&gt; Thomas Shenk [price] =&gt; 49.99 ) [28] =&gt; Array ( [title] =&gt; Test [author] =&gt; Eric Gross [price] =&gt; 100.00 ) </code></pre> <p>) <hr>PHP For Fun And Profit<br /> 5<br /> <b>Notice</b>: Undefined index: 5 in <b>C:\xampp\htdocs\FinalProject\cart.php</b> on line <b>52</b><br /></p> <p><br /> 3<br /> <b>Notice</b>: Undefined index: 3 in <b>C:\xampp\htdocs\FinalProject\cart.php</b> on line <b>52</b><br /></p> <p>Title&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Author&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Price</p>
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