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POOptimising PHP cURL based link checker script - currently very slow
 

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  1. POOptimising PHP cURL based link checker script - currently very slow
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    <p>I'm using a PHP script (using cURL) to check whether:</p> <ul> <li>The links in my database are correct (ie return HTTP status 200)</li> <li>The links are in fact redirected and redirect to an appropriate/similar page (using the contents of the page )</li> </ul> <p>The results of this are saved to a log file and emailed to me as an attachment.</p> <p>This is all fine and working, however it is slow as all hell and half the time it times out and aborts itself early. Of note, I have about 16,000 links to check.</p> <p>Was wondering how best to make this run quicker, and what I'm doing wrong?</p> <p>Code below:</p> <pre><code>function echoappend ($file,$tobewritten) { fwrite($file,$tobewritten); echo $tobewritten; } error_reporting(E_ALL); ini_set('display_errors', '1'); $filename=date('YmdHis') . "linkcheck.htm"; echo $filename; $file = fopen($filename,"w+"); try { $conn = new PDO('mysql:host=localhost;dbname=databasename',$un,$pw); $conn-&gt;setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); echo '&lt;b&gt;connected to db&lt;/b&gt;&lt;br /&gt;&lt;br /&gt;'; $sitearray = array("medical.posterous","ebm.posterous","behavenet","guidance.nice","www.rch","emedicine","www.chw","www.rxlist","www.cks.nhs.uk"); foreach ($sitearray as $key =&gt; $value) { $site=$value; echoappend ($file, "&lt;h1&gt;" . $site . "&lt;/h1&gt;"); $q="SELECT * FROM link WHERE url LIKE :site"; $stmt = $conn-&gt;prepare($q); $stmt-&gt;execute(array(':site' =&gt; 'http://' . $site . '%')); $result = $stmt-&gt;fetchAll(); $totallinks = 0; $workinglinks = 0; foreach($result as $row) { $ch = curl_init(); $originalurl = $row['url']; curl_setopt($ch, CURLOPT_URL, $originalurl); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_NOBODY, true); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false); $output = curl_exec($ch); if ($output === FALSE) { echo "cURL Error: " . curl_error($ch); } $urlinfo = curl_getinfo($ch); if ($urlinfo['http_code'] == 200) { echoappend($file, $row['name'] . ": &lt;b&gt;working!&lt;/b&gt;&lt;br /&gt;"); $workinglinks++; } else if ($urlinfo['http_code'] == 301 || 302) { $redirectch = curl_init(); curl_setopt($redirectch, CURLOPT_URL, $originalurl); curl_setopt($redirectch, CURLOPT_HEADER, 1); curl_setopt($redirectch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($redirectch, CURLOPT_NOBODY, false); curl_setopt($redirectch, CURLOPT_FOLLOWLOCATION, true); $redirectoutput = curl_exec($redirectch); $doc = new DOMDocument(); @$doc-&gt;loadHTML($redirectoutput); $nodes = $doc-&gt;getElementsByTagName('title'); $title = $nodes-&gt;item(0)-&gt;nodeValue; echoappend ($file, $row['name'] . ": &lt;b&gt;redirect ... &lt;/b&gt;" . $title . " ... "); if (strpos(strtolower($title),strtolower($row['name']))===false) { echoappend ($file, "FAIL&lt;br /&gt;"); } else { $header = curl_getinfo($redirectch); echoappend ($file, $header['url']); echoappend ($file, "SUCCESS&lt;br /&gt;"); } curl_close($redirectch); } else { echoappend ($file, $row['name'] . ": &lt;b&gt;FAIL code&lt;/b&gt;" . $urlinfo['http_code'] . "&lt;br /&gt;"); } curl_close($ch); $totallinks++; } echoappend ($file, '&lt;br /&gt;'); echoappend ($file, $site . ": " . $workinglinks . "/" . $totallinks . " links working. &lt;br /&gt;&lt;br /&gt;"); } $conn = null; echo '&lt;br /&gt;&lt;b&gt;connection closed&lt;/b&gt;&lt;br /&gt;&lt;br /&gt;'; } catch(PDOException $e) { echo 'ERROR: ' . $e-&gt;getMessage(); } </code></pre>
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    1. COwhen your script abort itself, what is the error message?
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    2. COTry `CURLOPT_CONNECTTIMEOUT` and `CURLOPT_TIMEOUT` and set it to 5(?) seconds.
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    3. COI got "PHP Fatal error: Maximum execution time of 30 seconds exceeded" on these lines: "$output = curl_exec($ch);" and "$redirectoutput = curl_exec($redirectch);"
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