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<!DOCTYPE html>
<html>
<head>
    <title>Price List</title>
    <meta charset="utf-8" />
</head>
<body>
<form method="get" action="#">
    Price List: <textarea name="priceList" rows="15" cols="120">  <table class="priceListTable">
            <tr> <th>Product</th> <th>Category</th> <th>Price</th> <th>Currency</th></tr>
            <tr> <td>8GB DDR3L 1600 KINGSTON SODIMM</td><td>RAM</td><td>87.00</td>  <td>  USD</td></tr>
            <tr> <td>500GB Toshiba, SATA 6Gb/s, 7200rpm, 32MB</td> <td>HDD</td> <td>18.41</td> <td>BGN </td></tr>
            <tr> <td>AMD A10-5800K X4 3.8GHz, 4MB Cache</td><td>CPU</td>   <td> 186.00</td> <td>BGN </td></tr>
            <tr> <td> SSD 2.5&quot;, 120GB, Corsair F120 LS, SATA3</td> <td> HDD</td> <td> 180.50</td> <td> BGN </td>  </tr>
            <tr> <td>500GB Toshiba, SATA 6Gb/s, 7200rpm, 32MB</td> <td>HDD</td> <td>28.41</td> <td>BGN </td> </tr>
            <tr> <td>ASRock B75M-GL R2.0</td><td>motherboard</td> <td>  47.55</td> <td>EUR</td>  </tr>
            <tr> <td>1TB Toshiba, SATA 6Gb/s, 7200rpm, 32MB</td> <td>HDD</td><td> 52.82 </td> <td>EUR</td></tr>
            <tr> <td>16GB Micro SDHC, A-Data, Class10</td><td>RAM   </td><td>15.03</td><td>BGN</td></tr>
            <tr> <td>500GB Toshiba, SATA 6Gb/s, 7200rpm, 32MB</td> <td>HDD</td> <td>38.41</td> <td>BGN </td>    </tr>
        </table></textarea> <br/>
    <input type="submit" value="Send" />
</form>

<?php
if (!isset($_GET['priceList'])) die;

$inputHtml = $_GET['priceList'];
$pattern = "|<td>\s*(.*?)\s*</td>\s*<td>\s*(.*?)\s*</td>\s*<td>\s*(.*?)\s*</td>\s*<td>\s*(.*?)\s*</td>|";
preg_match_all($pattern, $inputHtml, $matches, PREG_SET_ORDER);
$categories = [];
foreach ($matches as $match) {
    $category = html_entity_decode($match[2]);
    $item = [
        'product' => html_entity_decode($match[1]),
        'price' => html_entity_decode($match[3]),
        'currency' => html_entity_decode($match[4])
    ];
    if (!isset($categories[$category])) {
        $categories[$category] = [];
    }
    array_push($categories[$category], $item);
}

ksort($categories);
foreach ($categories as $category => $items) {
    usort($items, function($a, $b) {
        return strcmp($a['product'], $b['product']);
    });
    $categories[$category] = $items;
}

echo json_encode($categories);