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69 lines
2.0 KiB
69 lines
2.0 KiB
<?php
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namespace Telegraph;
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use DOMXPath, DOMDocument;
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class FindLinks {
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public static function all($input) {
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if(is_string($input)) {
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return self::inHTML($input);
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} elseif(is_array($input)) {
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$links = [];
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// This recursively iterates over the whole input array and searches for
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// everything that looks like a URL regardless of its depth or property name.
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// For items with a key of "html", it parses the value as HTML instead of text.
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// This supports handling the XRay parsed result format
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foreach(new \RecursiveIteratorIterator(new \RecursiveArrayIterator($input)) as $key => $value) {
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if($key === 'html') {
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$links = array_merge($links, self::inHTML($value));
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}
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else {
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$links = array_merge($links, self::inText($value));
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}
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}
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return array_unique($links);
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} else {
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return [];
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}
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}
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/**
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* find all links in text.
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* @param $input string text block
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* @return mixed array of links in text block.
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*/
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public static function inText($input) {
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if(!is_string($input)) return [];
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preg_match_all('/https?:\/\/[^ ]+/', $input, $matches);
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return array_unique($matches[0]);
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}
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/**
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* find all links in text.
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* @param $input string text block
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* @return mixed array of links in text block.
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*/
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public static function inHTML($html) {
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if(!is_string($html)) return [];
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$doc = new DOMDocument();
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libxml_use_internal_errors(true); # suppress parse errors and warnings
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@$doc->loadHTML(self::toHtmlEntities($html), LIBXML_NOWARNING|LIBXML_NOERROR);
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libxml_clear_errors();
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if(!$doc) return [];
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$xpath = new DOMXPath($doc);
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$links = [];
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foreach($xpath->query('//a[@href]') as $href) {
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$links[] = $href->getAttribute('href');
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}
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return array_unique($links);
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}
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private static function toHtmlEntities($input) {
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return mb_convert_encoding($input, 'HTML-ENTITIES', mb_detect_encoding($input));
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}
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}
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