curl_multi_init单线程改多线程
问题：
如何将以下单线程curl代码改写成多线程版本，利用curl_multi_init提高效率？
for ($i=0; $i < 100; $i++) {
$res[$key] = post($url, 'key='.$i);
}答案：
以下是使用curl_multi_init实现多线程版本的代码：
$newData = array_chunk($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);
}相对于单线程版本，此代码通过curl_multi_init同时执行多个curl请求，并使用curl_multi_exec等函数控制这些请求的执行流程，从而提高了效率。
