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    <p>You set up each cURL handle in the same way, then add them to a <code>curl_multi_</code> handle. The functions to look at are the <code>curl_multi_*</code> functions <a href="http://us.php.net/manual/en/ref.curl.php" rel="noreferrer">documented here</a>. In my experience, though, there were issues with trying to load too many URLs at once (though I can't find my notes on it at the moment), so the last time I used <code>curl_mutli_</code>, I set it up to do batches of 5 URLs at a time.</p> <p><strong><em>edit</em></strong>: Here is a reduced version of the code I have using <code>curl_multi_</code>:</p> <p><em>edit</em>: Slightly rewritten and lots of added comments, which hopefully will help.</p> <pre><code>// -- create all the individual cURL handles and set their options $curl_handles = array(); foreach ($urls as $url) { $curl_handles[$url] = curl_init(); curl_setopt($curl_handles[$url], CURLOPT_URL, $url); // set other curl options here } // -- start going through the cURL handles and running them $curl_multi_handle = curl_multi_init(); $i = 0; // count where we are in the list so we can break up the runs into smaller blocks $block = array(); // to accumulate the curl_handles for each group we'll run simultaneously foreach ($curl_handles as $a_curl_handle) { $i++; // increment the position-counter // add the handle to the curl_multi_handle and to our tracking "block" curl_multi_add_handle($curl_multi_handle, $a_curl_handle); $block[] = $a_curl_handle; // -- check to see if we've got a "full block" to run or if we're at the end of out list of handles if (($i % BLOCK_SIZE == 0) or ($i == count($curl_handles))) { // -- run the block $running = NULL; do { // track the previous loop's number of handles still running so we can tell if it changes $running_before = $running; // run the block or check on the running block and get the number of sites still running in $running curl_multi_exec($curl_multi_handle, $running); // if the number of sites still running changed, print out a message with the number of sites that are still running. if ($running != $running_before) { echo("Waiting for $running sites to finish...\n"); } } while ($running &gt; 0); // -- once the number still running is 0, curl_multi_ is done, so check the results foreach ($block as $handle) { // HTTP response code $code = curl_getinfo($handle, CURLINFO_HTTP_CODE); // cURL error number $curl_errno = curl_errno($handle); // cURL error message $curl_error = curl_error($handle); // output if there was an error if ($curl_error) { echo(" *** cURL error: ($curl_errno) $curl_error\n"); } // remove the (used) handle from the curl_multi_handle curl_multi_remove_handle($curl_multi_handle, $handle); } // reset the block to empty, since we've run its curl_handles $block = array(); } } // close the curl_multi_handle once we're done curl_multi_close($curl_multi_handle); </code></pre> <p>Given that you don't need anything back from the URLs, you probably don't need a lot of what's there, but this is how I chunked the requests into blocks of <code>BLOCK_SIZE</code>, waited for each block to run before moving on, and caught errors from cURL.</p>
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    1. POHow can I use cURL to open multiple URLs simultaneously with PHP?
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    1. POHow can I use cURL to open multiple URLs simultaneously with PHP?
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    1. COWell all I'm going to have it do is load each url (and the urls it will be loading are blank pages, accessing the urls only start a script and make it run for a preset amount of time) and not save or output any data. Do you think it will cause any problems in this case?
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    2. COMy guess is that it won't be a problem in that case, but I don't know for sure--if it fails to run or errors out when you try to load all of them at once, you could put a counter in your `while` loop and whenever `counter % batch_size == 0` inside the loop, run the batch and clear it.
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    3. COWoah. hate to bother you with this, but could you please comment some stuff in that code so I can see what everything does exactly?
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