Can some one explain this array?

[ballhogjoni]

what is going on in this line of code?

 

foreach ($items as $item) {

$contents[$item] = (isset($contents[$item])) ? $contents[$item] + 1 : 1;

}

[per1os]

for every item in array of items create a new index of $item in the $contents array and if it is already set add one, else set it to one.

[ballhogjoni]

Ok, this may be complicated, for me it is over my head. How can you tell php to create a xml structure for the following code?

 

<?php
function showCart() {
global $db;
$cart = $_SESSION['cart'];
if ($cart) {
	$items = explode(',',$cart);
	$contents = array();
	foreach ($items as $item) {
		$contents[$item] = (isset($contents[$item])) ? $contents[$item] + 1 : 1;
	}
	$output[] = '<form action="cart.php?action=update" method="post" id="cart">';
	$output[] = '<table width="500px" style="border:1px solid #EEEEEE;">';
	$output[] = '<tr>';
	$output[] = '<td>';
	$output[] = '<table align="center">';
	$output[] = '<tr>';
		$output[] = '<td align="center" class="style1">Item</td>';
		$output[] = '<td align="center" class="style1">Qty</td>';
		$output[] = '<td align="center" class="style1">Price</td>';
		$output[] = '<td align="center" class="style1">Sub Total</td>';
		$output[] = '</tr>';
	foreach ($contents as $id=>$qty) {
		$sql = 'SELECT * FROM products WHERE id = '.$id;
		$result = $db->query($sql);
		$row = $result->fetch();
		extract($row);
		$output[] = '<tr>';
		$output[] = '<td class="style4" align="center">'.$title.'</td>';
		$output[] = '<td align="center"><input type="text" name="qty'.$id.'" value="'.$qty.'" size="3" maxlength="3" /></td>';
		$output[] = '<td class="style4" align="center">$'.$price.'</td>';
		$output[] = '<td class="style4" align="center">$'.($price * $qty).'</td>';
		$output[] = '<td align="center"><a href="cart.php?action=delete&id='.$id.'" class="r"><img src="images/delete.jpg" alt="delete the diaper cake product" border="0" width="22" height="25"></a></td>';
		$total += $price * $qty;
		$output[] = '</tr>';
	}
	$output[] = '</table>';
	$output[] = '<table align="center" width="500px">';
	$output[] = '<tr>';
	$output[] = '<td>';
	$output[] = '</td>';
	$output[] = '<td align="right">';
	$output[] = '<button type="submit">Update Qty</button>';
	$output[] = '</td>';
	$output[] = '</tr>';
	$output[] = '<tr>';
	$output[] = '<td>';
	$output[] = '</td>';
	$output[] = '<td align="right" style="font-size:large">';
	$output[] = 'Total:';
	$output[] = '</td>';
	$output[] = '<td style="font-size:medium; font-weight:bold; text-align:center;">$'.$total;
	$output[] = '</td>';
	$output[] = '</tr>';
	$output[] = '</table>';
	$output[] = '</form>';
} else {
	$output[] = '<p class="style4">You shopping cart is empty.</p>';
}
return join('',$output);
}
?>