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(PHP ActiveX) A Simple Web CrawlerThis demonstrates a very simple web crawler using the Chilkat Spider component.
<?php // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Spider') $spider = new COM("Chilkat.Spider"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringArray') $seenDomains = new COM("Chilkat.StringArray"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringArray') $seedUrls = new COM("Chilkat.StringArray"); $seenDomains->Unique = 1; $seedUrls->Unique = 1; // You will need to change the start URL to something else... $seedUrls->Append('http://something.whateverYouWant.com/'); // Set outbound URL exclude patterns // URLs matching any of these patterns will not be added to the // collection of outbound links. $spider->AddAvoidOutboundLinkPattern('*?id=*'); $spider->AddAvoidOutboundLinkPattern('*.mypages.*'); $spider->AddAvoidOutboundLinkPattern('*.personal.*'); $spider->AddAvoidOutboundLinkPattern('*.comcast.*'); $spider->AddAvoidOutboundLinkPattern('*.aol.*'); $spider->AddAvoidOutboundLinkPattern('*~*'); // Use a cache so we don't have to re-fetch URLs previously fetched. $spider->CacheDir = 'c:/spiderCache/'; $spider->FetchFromCache = 1; $spider->UpdateCache = 1; while ($seedUrls->Count > 0) { $url = $seedUrls->pop(); $spider->Initialize($url); // Spider 5 URLs of this domain. // but first, save the base domain in seenDomains $domain = $spider->getUrlDomain($url); $seenDomains->Append($spider->getBaseDomain($domain)); for ($i = 0; $i <= 4; $i++) { $success = $spider->CrawlNext(); if ($success == 1) { // Display the URL we just crawled. print $spider->LastUrl . "\n"; // If the last URL was retrieved from cache, // we won't wait. Otherwise we'll wait 1 second // before fetching the next URL. if ($spider->LastFromCache != 1) { $spider->SleepMs(1000); } } else { // cause the loop to exit.. $i = 999; } } // Add the outbound links to seedUrls, except // for the domains we've already seen. for ($i = 0; $i <= $spider->NumOutboundLinks - 1; $i++) { $url = $spider->getOutboundLink($i); $domain = $spider->getUrlDomain($url); $baseDomain = $spider->getBaseDomain($domain); if ($seenDomains->Contains($baseDomain) == 0) { // Don't let our list of seedUrls grow too large. if ($seedUrls->Count < 1000) { $seedUrls->Append($url); } } } } ?> |
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