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    <p>Since you are new to this, I'll explain that you can use PHP's HTML parser known as <a href="http://php.net/domdocument" rel="nofollow"><code>DOMDocument</code></a> to extract what you need. You should <strong>not</strong> use a regular expression as they are inherently error prone when it comes to parsing HTML, and can easily result in many false positives.</p> <p>To start, lets say you have your HTML:</p> <pre><code>$html = '&lt;a href="http://www.mydomain.com/galeria/thumbnails.php?album=774" target="_blank"&gt;&lt;img alt="/" src="http://img255.imageshack.us/img00/000/000001.png" height="133" width="113"&gt;&lt;/a&gt;'; </code></pre> <p>And now, we load that into DOMDocument:</p> <pre><code>$doc = new DOMDocument; $doc-&gt;loadHTML( $html); </code></pre> <p>Now, we have that HTML loaded, it's time to find the elements that we need. Let's assume that you can encounter other <code>&lt;a&gt;</code> tags within your document, so we want to find those <code>&lt;a&gt;</code> tags that have a direct <code>&lt;img&gt;</code> tag as a child. Then, check to make sure we have the correct nodes, we need to make sure we extract the correct information. So, let's have at it:</p> <pre><code>$results = array(); // Loop over all of the &lt;a&gt; tags in the document foreach( $doc-&gt;getElementsByTagName( 'a') as $a) { // If there are no children, continue on if( !$a-&gt;hasChildNodes()) continue; // Find the child &lt;img&gt; tag, if it exists foreach( $a-&gt;childNodes as $child) { if( $child-&gt;nodeType == XML_ELEMENT_NODE &amp;&amp; $child-&gt;tagName == 'img') { // Now we have the &lt;a&gt; tag in $a and the &lt;img&gt; tag in $child // Get the information we need: parse_str( parse_url( $a-&gt;getAttribute('href'), PHP_URL_QUERY), $a_params); $results[] = array( $a_params['album'], $child-&gt;getAttribute('src')); } } } </code></pre> <p>A <code>print_r( $results);</code> now <a href="http://3v4l.org/2e2m4#v512" rel="nofollow">leaves us with</a>:</p> <pre><code>Array ( [0] =&gt; Array ( [0] =&gt; 774 [1] =&gt; http://img255.imageshack.us/img00/000/000001.png ) ) </code></pre> <p>Note that this omits basic error checking. One thing you can add is in the inner <code>foreach</code> loop, you can check to make sure you successfully parsed an <code>album</code> parameter from the <code>&lt;a&gt;</code>'s <code>href</code> attribute, like so:</p> <pre><code>if( isset( $a_params['album'])) { $results[] = array( $a_params['album'], $child-&gt;getAttribute('src')); } </code></pre> <p>Every function I've used in this can be found in the <a href="http://php.net/manual" rel="nofollow">PHP documentation</a>.</p>
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    1. COVery thorough explanation. If I could, I'd give it an extra +1 for spelling it out so well. Just one thing - wouldn't it be more efficient to use an xpath query to get the image under the anchor tag than to iterate through each of the child nodes?
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      1. USJoshua Kaiser
    2. CO@Joshua - It would, but I didn't want to introduce XPath - I felt it was too much for the scope of this solution.
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    3. COWorks perfectly! Many thanks!
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      1. USMarijn Schoo
 

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