我正在尝试尽快请求多个 API。所以我尝试了curl_multi。但我得到的结果比 foreach 和 file_get_contents 慢。我做错了什么？

使用file_get_contents：

<?php
$start = microtime(true);
$urls = array("https://www.example1.com/", "https://www.example2.com/", "https://www.example3.com/");

foreach ($urls as $url) {
    $result = file_get_contents($url);
}

echo microtime(true) - $start;
?>

使用curl_multi：

<?php
$start = microtime(true);
$urls = array("https://www.example1.com/", "https://www.example2.com/", "https://www.example3.com/");
$urls_count = count($urls);
$curl_arr = array();
$master = curl_multi_init();

for($i = 0; $i < $urls_count; $i++)
{
    $curl_arr[$i] = curl_init($urls[$i]);
    curl_setopt($curl_arr[$i], CURLOPT_RETURNTRANSFER, true);
    curl_multi_add_handle($master, $curl_arr[$i]);
}

do {
    curl_multi_exec($master,$running);
} while($running > 0);

for($i = 1; $i < $urls_count; $i++)
{
    $results = curl_multi_getcontent  ( $curl_arr[$i]  );
}

echo microtime(true) - $start;
?>