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获取HTML文档中链接的绝对URL集合及其关联元素。

用法

从Web页面获取LinkCollection

use webignition\HtmlDocumentLinkUrlFinder\HtmlDocumentLinkUrlFinder;
use webignition\WebResource\WebPage\WebPage;

$webPageUrl = 'http://www.google.co.uk/search?q=Hello+World';
$webPage = WebPage::createFromContent((string) file_get_contents($sourceUrl));

$finder = new HtmlDocumentLinkUrlFinder();
$linkCollection = $finder->getLinkCollection($webPage, $webPageUrl);

访问LinkCollection

use Psr\Http\Message\UriInterface;

// Assuming $linkCollection from previous example

// Iterating
foreach ($linkCollection as $link) {
    $link->getUri();      // UriInterface instance
    $link->getElement();  // \DOMElement instance
}

// Counting
count($linkCollection);

// Get URIs only
$linkCollection->getUris(); // array of UriInterface

// Get unique URIs only
$linkCollection->getUniqueUris(); // array of UriInterface

过滤LinkCollection

所有LinkCollection::filterBy*()方法都返回一个新的LinkCollection实例。

use webignition\Uri\ScopeComparer;

// Filtering
$anchorLinks = $linkCollection->filterByElementName('a');
$elementsWithRelStylesheetAttribute = $linkCollection->filterByAttribute('rel', 'stylesheet');
$linksWithinUrlScope = $linkCollection->filterByUrlScope(
    new ScopeComparer(),
    ['http://example.com/']
);

$linkElementsWithRelStylesheetAttribute = $linkCollection
    ->filterByElementName('link')
    ->filterByAttribute('rel', 'stylesheet');