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    <blockquote> <p><strong>DISCLAIMER:</strong> This answer links an open-source project with which I'm involved. There. You've been warned.</p> </blockquote> <p>The <a href="https://github.com/rdlowrey/Artax" rel="nofollow">Artax HTTP client</a> is a socket-based HTTP library that (among other things) offers custom control over the number of concurrent open socket connections to individual hosts while making multiple asynchronous HTTP requests.</p> <p>Limiting the number of concurrent connections is easily accomplished. Consider:</p> <pre><code>&lt;?php use Artax\Client, Artax\Response; require dirname(__DIR__) . '/autoload.php'; $client = new Client; // Defaults to max of 8 concurrent connections per host $client-&gt;setOption('maxConnectionsPerHost', 2); $requests = array( 'so-home' =&gt; 'http://stackoverflow.com', 'so-php' =&gt; 'http://stackoverflow.com/questions/tagged/php', 'so-python' =&gt; 'http://stackoverflow.com/questions/tagged/python', 'so-http' =&gt; 'http://stackoverflow.com/questions/tagged/http', 'so-html' =&gt; 'http://stackoverflow.com/questions/tagged/html', 'so-css' =&gt; 'http://stackoverflow.com/questions/tagged/css', 'so-js' =&gt; 'http://stackoverflow.com/questions/tagged/javascript' ); $onResponse = function($requestKey, Response $r) { echo $requestKey, ' :: ', $r-&gt;getStatus(); }; $onError = function($requestKey, Exception $e) { echo $requestKey, ' :: ', $e-&gt;getMessage(); } $client-&gt;requestMulti($requests, $onResponse, $onError); </code></pre> <p><em>IMPORTANT</em>: In the above example the <code>Client::requestMulti</code> method is making all the specified requests <strong>asynchronously</strong>. Because the per-host concurrency limit is set to <code>2</code>, the client will open up new connections for the first two requests and subsequently reuse those same sockets for the other requests, queuing requests until one of the two sockets become available.</p>
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    1. POmulti-thread, multi-curl crawler in PHP
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    1. CO+1 it would need many more lines with php-curl, but haven't tested your lib yet
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    2. CO+1 - Looks much easier than cURL.
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      1. USuınbɐɥs
    3. COWell, this looks awesome, and like a proper solution. We're looking forward to implement it. Thanks in advance!
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      1. USChris Russo
 

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