How to change `curl_multi_init` single thread to multi thread - php-analytics-data

Question

Ask experts how to change to curl_multi_init multi-threaded?
My idea is to split the $data array into array_chunk($data, 15, true); and then do CURL, but I'm a novice, I don't understand the examples on the Internet, please help
Simulate 100 pieces of data:
function post($url, $data = '', $head = 'application/x-www-form-urlencoded')
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-type:{$head};charset=utf-8;"));
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
if (!empty($data)) {
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
}
$output = curl_exec($ch);
curl_close($ch);
return $output;
}
$url = 'http://localhost/test.php';
$res = [];
for ($i=0; $i < 100; $i++) {
$res[$key] = post($url, 'key='.$i);
}
var_dump($res);
The code below, I know it must be wrong, please correct me, thank you！！
$newData = array_chunk($data, 10, true);
foreach ($newData as $k=> $tmp) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-type:application/x-www-form-urlencoded;charset=utf-8;"));
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
$mh = curl_multi_init();
foreach ($tmp as $key => $value) {
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $tmp);
curl_multi_add_handle($mh, $ch);
}
$active = null;
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($active && $mrc == CURLM_OK) {
if (curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
$res[$k] = curl_multi_getcontent($ch);
curl_multi_remove_handle($mh, $ch);
curl_multi_close($mh);
}

Answer 1

There were several issues in your original code, which were fixed in the code above.
Each $ch should be an independent handle, not a common one
curl_multi_getcontent should be called on each $ch handle, you are equivalent to only calling the last $ch of each group.
curl_multi_remove_handle should be called on each $ch handle. It is more appropriate to call it after the previous curl_multi_getcontent.
$newData = array_chunk($data, 10, true);
foreach ($newData as $k => $tmp) {
$mh = curl_multi_init();
$chs = [];
foreach ($tmp as $key => $url) {
$ch = curl_init();
$chs[$key] = $ch;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-type:application/x-www-form-urlencoded;charset=utf-8;'));
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $tmp);
curl_multi_add_handle($mh, $ch);
}
$active = null;
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($active && $mrc == CURLM_OK) {
if (curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
foreach ($chs as $key => $ch) {
$res[$k][$key] = curl_multi_getcontent($ch);
curl_multi_remove_handle($mh, $ch);
}
curl_multi_close($mh);
}
var_dump($res);