Targetting URLs with parameters

I want to grab the URL with highest pg value:

pg

$html ='
<a href="http://example.com/?pg=1"></a>
<a href="http://example.com/?pg=2"></a>
<a href="http://example.com/?pg=3"></a>
';


I use this regex to locate the appropriate links:

preg_match_all('/<a.*href="./?pg=(d+)".*>(?:.*)</a>/U', $html, $preg_matches);


Sometimes, the links include another parameter:

http://example.com/?pg=3&test=1


My question is, how do I adjust my regex so links with the added parameters are included as well?

.

"

[^"]

<a href="http://example.com/?pg=4&test=1">a</a>

$html

2 Answers
2

Example:

$dom = new DOMDocument;
$dom->loadHTML($html);

$html ='
<a href="http://example.com/?pg=1"></a>
<a href="http://example.com/?pg=2"></a>
<a href="http://example.com/?pg=3"></a>
';
$anchors = $dom->getElementsByTagName('a');

foreach ($anchors as $anchor)
$url = $anchor->getAttribute('href');
$query = parse_url($url, PHP_URL_QUERY);
parse_str($query, $output);
$pg = $output['pg'];
//do something



Here's a helpful tutorial for PHP. http://htmlparsing.com/php.html

Also see here, why you should not use Regex for parsing html https://stackoverflow.com/a/1732454/81785

$html ='
<a href="http://example.com/?pg=1"></a>
<a href="http://example.com/?pg=2"></a>
<a href="http://example.com/?pg=4&test=1"></a>
';
preg_match_all('/<a[^>]+href="(.*?)"[^>]*>(.*)?</a>/', $html, $out);

$result = null;
foreach ($out[1] as $link)
parse_str(parse_url($link, PHP_URL_QUERY), $atr);
$result[$link] = $atr['pg'];


print_r($result);

// "http://example.com/?pg=1" => "1"
// "http://example.com/?pg=2" => "2"
// "http://example.com/?pg=4&test=1" => "4"


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