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curl_multi_exec

robert dot reichel at boboton dot com
20-Oct-2007 05:54


I was testing PHP code provided by dtorop933@gmail.com in curl_multi_exec section of PHP Manual.



The part of the code '$err = curl_error($conn[$i])' should return error message for each cURL session, but it does not.

The function curl_error() works well with the curl_exec(). Is there any other solution for getting session error message with curl_multi_exec() or there is a bug in cURL library.



The script was tested with Windows XP and PHP-5.2.4

shichuanr at gmail dot com
06-Sep-2007 05:12


For people who have problem running the above example script(Example 425. curl_multi_exec()), you can alter it a little bit to make it work properly by replacing the existing chunk of code with the one below: 



<?php

// create both cURL resources

$ch1 = curl_init();

$ch2 = curl_init();



// set URL and other appropriate options

curl_setopt($ch1, CURLOPT_URL, "http://www.google.com/");

curl_setopt($ch1, CURLOPT_HEADER, 0);

curl_setopt($ch2, CURLOPT_URL, "http://www.php.net/");

curl_setopt($ch2, CURLOPT_HEADER, 0);



//create the multiple cURL handle

$mh = curl_multi_init();



//add the two handles

curl_multi_add_handle($mh,$ch1);

curl_multi_add_handle($mh,$ch2);



$running=null;

//execute the handles

do {

    curl_multi_exec($mh,$running);

} while ($running > 0);

//close the handles

curl_multi_remove_handle($mh,$ch1);

curl_multi_remove_handle($mh,$ch1);

curl_multi_close($mh);



?>

substr("iscampifriese",1,11) dot " at beer dot com"
04-Jul-2007 06:10


If you are using mulit handles and you wish to re-execute any of them (if they timed out or something), then you need to remove the handles from the mulit-handle and then re-add them in order to get them to re-execute.  Otherwise cURL will just give you back the same results again without actually retrying.

dtorop933 at gmail dot com
07-Jan-2005 10:21


<?php

$connomains = array(

   "http://www.cnn.com/",

   "http://www.canada.com/",

   "http://www.yahoo.com/"

);



$mh = curl_multi_init();



foreach ($connomains as $i => $url) {

  $conn[$i] = curl_init($url);

  curl_setopt($conn[$i], CURLOPT_RETURNTRANSFER, 1);

  curl_multi_add_handle ($mh,$conn[$i]);

}



// start performing the request

do {

  $mrc = curl_multi_exec($mh, $active);

} while ($mrc == CURLM_CALL_MULTI_PERFORM);



while ($active and $mrc == CURLM_OK) {

  // wait for network

  if (curl_multi_select($mh) != -1) {

    // pull in any new data, or at least handle timeouts

    do {

      $mrc = curl_multi_exec($mh, $active);

    } while ($mrc == CURLM_CALL_MULTI_PERFORM);

  }

}



if ($mrc != CURLM_OK) {

  print "Curl multi read error $mrc\n";

}



// retrieve data

foreach ($connomains as $i => $url) {

  if (($err = curl_error($conn[$i])) == '') {

    $res[$i]=curl_multi_getcontent($conn[$i]);

  } else {

    print "Curl error on handle $i: $err\n";

  }

  curl_multi_remove_handle($mh,$conn[$i]);

  curl_close($conn[$i]);

}

curl_multi_close($mh);



print_r($res);

?>

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