PHP curl_multi_exec runs once - php

Question

I'm having trouble creating multiple xml requests using php's curl_multi_exec.
The problem is that the do...while loop containing the curl_multi_exec command runs only once and then quits.
Resources Used:
http://www.phpied.com/simultaneuos-http-requests-in-php-with-curl/
http://php.net/manual/en/function.curl-multi-exec.php/
http://www.rustyrazorblade.com/2008/02/curl_multi_exec/
Take a look at my code:
//Multi handle curl initialization
$mh = curl_multi_init();
//set url
$url = 'my_url';
foreach($latLng as $id => $l) {
$ch[$id] = curl_init();
//$request previously set
//Initialize and set options
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $request);
//add to multi_handle
curl_multi_add_handle($mh, $ch[$id]);
}
//Execute the handles
$running = null;
do {
$mrc = curl_multi_exec($mh, $running);
$ready=curl_multi_select($mh);
echo "Ran once\n";
} while ($mrc == CURLM_CALL_MULTI_PERFORM && $ready > 0);
while ($active && $mrc == CURLM_OK) {
if ($curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh, $running);
echo "Ran again\n";
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
foreach ($mh as $c) {
// HTTP response code
$code = curl_getinfo($c, CURLINFO_HTTP_CODE);
// cURL error number
$curl_errno = curl_errno($c);
// cURL error message
$curl_error = curl_error($c);
// output if there was an error
if ($curl_error) {
echo("*** cURL error: ($curl_errno) $curl_error\n");
}
}
//get content and remove handles
foreach ($ch as $c) {
$result[] = curl_multi_getcontent($c);
curl_multi_remove_handle($mh, $c);
}
print_r($result);
//Close curl
curl_multi_close($mh);
}
I know the request is valid because I receive the correct return data when I perform a single curl execution. The problem lies with the curl_multi_exec().
The output I am receiving is "Ran once" followed by the empty arrays of the curl_multi_getcontent() calls. See below:
Ran once
Array
(
[0] =>
[1] =>
[2] =>
[3] =>
[4] =>
[5] =>
[6] =>
[7] =>
[8] =>
)
Any help is greatly appreciated.

Answer 1

You're not setting up the curl options correctly:
Currently, you're setting options on $ch which is your array, you need to be setting the options specifically on the current curl handler, which in your loop is $ch[$id]:
//Initialize and set options
curl_setopt($ch[$id], CURLOPT_URL, $url);
curl_setopt($ch[$id], CURLOPT_HEADER, 0);
curl_setopt($ch[$id], CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch[$id], CURLOPT_POST, 1);
curl_setopt($ch[$id], CURLOPT_POSTFIELDS, $request);

Answer 2

change this:
foreach ($mh as $c) {
$code = curl_getinfo($c, CURLINFO_HTTP_CODE);
to:
for($i=1;$i<=count($array);$i++){
$code = curl_multi_getcontent($ch[$i]);
assuming $array is the array for your multiple $url.