我有一个这样的 HTML 代码：
<div id="invoice">
<div id="invoice-header"> <img alt="Mainlogo_large" class="logo screen" src="http://colosus.com/invoice/images/freeagent_logo.png">
<!-- hCard microformat -->
<div class="vcard" id="company-address">
<div class="fn org"><strong>KIOSBAN.COM</strong></div>
<div class="adr">
<div class="street-address">Gedung Atlantica Lt.4<br>
Jl. Kuningan Barat No. 7, Mampang<br>
</div>
<!-- street-address -->
<div class="locality">Indonesia</div>
<div id="company-postcode"><span class="region">Jakarta Selatan</span> <span class="postal-code">12710</span></div>
</div>
<!-- adr -->
<div class="email">fajar@kiosban.com</div>
<div id="sales-tax-reg-number">Fajar tampan</div>
</div>
<!-- company-address vcard -->
</div>
<!-- #invoice-header -->
<div id="invoice-info">
<h2>Invoice <strong>INV001</strong></h2>
<h3>21 February 2008</h3>
<p id="payment-terms">Payment Terms: 30 days</p>
<p id="payment-due">Payment due by 21 March 2008</p>
<p id="payment-total">£2643.75</p>
</div>
<!-- #invoice-info -->
<div class="vcard" id="client-details">
<div class="fn">John Doe</div>
<div class="org">Client Company</div>
<div class="adr">
<div class="street-address"> Client Street Address<br>
Street Address 2<br>
Street Address 3<br>
</div>
<!-- street-address -->
<div class="locality">LOCALITY</div>
<div id="client-postcode"><span class="region">Region</span> <span class="postal-code">MV2 8SX</span></div>
<div id="your-tax-number">SALES TAX: 193528491</div>
</div>
<!-- adr -->
</div>
<!-- #client-details vcard -->
<table id="invoice-amount">
<thead>
<tr id="header_row">
<th class="quantity_th">Quantity</th>
<th class="left details_th">Details</th>
<th class="unitprice_th">Unit Price (£)</th>
<th class="salestax_th">VAT</th>
<th class="subtotal_th">Net Subtotal (£)</th>
</tr>
</thead>
<tfoot>
<tr id="discount_tr">
<td colspan="2"> </td>
<td colspan="2" class="item_r">10% Discount</td>
<td class="item_r">£250.00</td>
</tr>
<tr id="net_total_tr">
<td colspan="2"> </td>
<td colspan="2" class="item_r">Net Total</td>
<td class="item_r">2250.00</td>
</tr>
<tr id="vat_tr">
<td colspan="2"> </td>
<td colspan="2" class="item_r">VAT</td>
<td class="item_r">393.75</td>
</tr>
<tr id="total_tr">
<td colspan="2"> </td>
<td colspan="2" class="total" id="total_currency"><span class="currency">GBP </span> Total</td>
<td class="total">£2643.75</td>
</tr>
</tfoot>
<tbody>
<tr class="item odd">
<td class="item_l">1 Day</td>
<td class="item_l">Details of project activity to be billed </td>
<td class="item_r">500.00</td>
<td class="item_r">17.5%</td>
<td class="item_r">500.00</td>
</tr>
<tr class="item">
<td class="item_l">2 Days</td>
<td class="item_l">Other Details of project activity to be billed </td>
<td class="item_r">1000.00</td>
<td class="item_r">17.5%</td>
<td class="item_r">1000.00</td>
</tr>
<tr class="item odd">
<td class="item_l">2 Days</td>
<td class="item_l">More d etails of project activity to be billed </td>
<td class="item_r">1500.00</td>
<td class="item_r">17.5%</td>
<td class="item_r">1000.00</td>
</tr>
</tbody>
</table>
<!-- invoice-amount -->
<div id="invoice-other">
<h2>Other Information</h2>
<div id="company-reg-number"><strong>Company Registration Number:</strong> 9273109</div>
<div id="contract-number"><strong>Contract/PO:</strong> PO 87227643</div>
</div>
<!-- invoice-other -->
<div id="payment-details">
<h2>Payment Details</h2>
<div id="bank_name">Bank Name</div>
<div id="sort-code"><strong>Bank/Sort Code:</strong> 32-75-97</div>
<div id="account-number"><strong>Account Number:</strong> 28270761</div>
<div id="iban"><strong>IBAN:</strong> 973547</div>
<div id="bic"><strong>BIC:</strong> 220197</div>
<div id="payment-reference"><strong>Payment Reference:</strong> INV001</div>
</div>
<!-- payment-details -->
<div id="comments">Payment should be made by bank transfer or cheque made payable to John Smith.</div>
<!-- comments -->
</div>
我的问题是：如何将内部的 HTML 代码唯一元素<div id='invoice'>bla bla bla</div>或该页面的指定 url(ex: localhost/invoice/index.php)转换为可下载的pdf？
我一直在搜索许多 pdf 类库，但找不到解决方案。
谁能给我一个解决方案、想法或可能的方法？