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<?php |
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/** |
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* @package org.openpsa.httplib |
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* @author The Midgard Project, http://www.midgard-project.org |
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* @copyright The Midgard Project, http://www.midgard-project.org |
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* @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License |
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*/ |
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use Symfony\Component\DomCrawler\Crawler; |
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/** |
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* Helpers for HTTP content fetching and handling |
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* |
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* @package org.openpsa.httplib |
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*/ |
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class org_openpsa_httplib_helpers extends midcom_baseclasses_components_purecode |
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{ |
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/** |
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* Get value of a meta tag in HTML page. |
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* |
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* @param string $html HTML to parse |
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* @param string $name Name of the meta tag to fetch |
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* @return ?string |
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*/ |
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public static function get_meta_value($html, $name) |
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{ |
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$crawler = new Crawler($html); |
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if ($crawler->filter('head meta[name="' . $name . '"]')->count() == 0) { |
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return null; |
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} |
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return (string) $crawler->filter('head meta[name="' . $name . '"]')->attr('content'); |
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} |
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/** |
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* Get value(s) of a link tag(s) in HTML page. |
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* |
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* @param string $html HTML to parse |
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* @param string $relation Relation (rel) or reverse relation (rev) of the link tag to fetch |
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* @return array Links matching given criteria as arrays containing keys title, href and optionally hreflang |
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*/ |
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public static function get_link_values($html, $relation) : array |
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{ |
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$crawler = new Crawler($html); |
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$nodes = $crawler->filter('head link[rel="' . $relation . '"]'); |
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return $nodes->each(function(Crawler $node, $i) { |
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$tag = ['title' => false, 'href' => false, 'hreflang' => false]; |
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foreach ($tag as $property => &$value) { |
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if ($node->attr($property) !== null) { |
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$value = $node->attr($property); |
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} |
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} |
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return $tag; |
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}); |
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} |
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/** |
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* Get value(s) of an anchor tag(s) in HTML page. |
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* |
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* @param string $html HTML to parse |
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* @param string $relation Relation (rel) of the anchor to fetch |
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* @return array Links matching given criteria as arrays containing keys title, href and value |
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*/ |
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public static function get_anchor_values($html, $relation) : array |
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{ |
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$crawler = new Crawler($html); |
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$nodes = $crawler->filter('a[rel="' . $relation . '"]'); |
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return $nodes->each(function(Crawler $node, $i) { |
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return [ |
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'title' => ($node->attr('title') !== null) ? $node->attr('title') : false, |
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'href' => ($node->attr('href') !== null) ? $node->attr('href') : false, |
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'value' => ($node->text() !== null) ? $node->text() : false, |
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]; |
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}); |
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} |
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} |
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flack /
openpsa
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