markdown PHP：curl_multi

Posted 2021-05-06

# PHP中同时发起多个http请求

```php
function multiCurl($urlArr)
{
    static $mh = null;
    if (empty($mh)) {
        $mh = curl_multi_init();
    }

    $conn = [];
    foreach ($urlArr as $i => $url) {
        $conn[$i] = curl_init($url);
        curl_setopt($conn[$i], CURLOPT_HTTPHEADER, []); // set header
        curl_setopt($conn[$i], CURLOPT_HEADER, 0); // no need header in output
        curl_setopt($conn[$i], CURLOPT_CONNECTTIMEOUT, 10);
        curl_setopt($conn[$i], CURLOPT_TIMEOUT, 15);//
        curl_setopt($conn[$i], CURLOPT_RETURNTRANSFER, true);

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

    do {
        curl_multi_exec($mh, $active);
        if (-1 == curl_multi_select($mh)) {
            usleep(1);
        }
    } while ($active);

    $result = [];
    $fails = [];
    foreach ($urlArr as $i => $url) {
        $ch = $conn[$i];
        $rawData = curl_multi_getcontent($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

        if ( false===$rawData || 200 != $httpCode ) {
            $fails[] = $url;
        } else {
            $result[$url] = $rawData;
        }

        curl_multi_remove_handle($mh, $ch);
        curl_close($ch);
    }

    if ( !empty($fails) ) {
        $result += multiCurl($fails);
    }

    if ( !empty($mh) ) {
        curl_multi_close($mh);
    }

    return $result;
}
```


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