Well… there are not many options. The most effectiv straight-forward approach is to store category/name/price in array instead of outputting them directly:
<?php
$data = array();
while ($reader->name === 'product') {
$node = $dom->importNode($reader->expand(), TRUE);
if ($xpath->evaluate('number(price)', $node) > $price_submitted) {
$category = $xpath->evaluate('string(@category)', $node);
$name = $xpath->evaluate('string(name)', $node);
$price = $xpath->evaluate('number(price)', $node);
$data[] = array($category, $name, $price);
$nameArray[] = $name;
}
$reader->next('product');
}
foreach ($nameArray as $names) {
echo $names . " ";
}
foreach ($data as $datum) {
// Relevant search results displayed here:
echo "Category: " . $datum[0] . ". ";
echo "Name: " . $datum[1] . ". ";
echo "Price: " . $datum[2] . ". ";
}
In case that doesn't work memory-wise (you mentioned that XML file is really large) you should use db- or file-backed temporary storage