如何使用PHP同时从多个Web服务中获取数据？

<?php

function multiRequest($data,$options = array()) {

  // array of curl handles
  $curly = array();
  // data to be returned
  $result = array();

  // multi handle
  $mh = curl_multi_init();

  // loop through $data and create curl handles
  // then add them to the multi-handle
  foreach ($data as $id => $d) {

    $curly[$id] = curl_init();

    $url = (is_array($d) && !empty($d['url'])) ? $d['url'] : $d;
    curl_setopt($curly[$id],CURLOPT_URL,$url);
    curl_setopt($curly[$id],CURLOPT_HEADER,0);
    curl_setopt($curly[$id],CURLOPT_RETURNTRANSFER,1);

    // post?
    if (is_array($d)) {
      if (!empty($d['post'])) {
        curl_setopt($curly[$id],CURLOPT_POST,1);
        curl_setopt($curly[$id],CURLOPT_POSTFIELDS,$d['post']);
      }
    }

    // extra options?
    if (!empty($options)) {
      curl_setopt_array($curly[$id],$options);
    }

    curl_multi_add_handle($mh,$curly[$id]);
  }

  // execute the handles
  $running = null;
  do {
    curl_multi_exec($mh,$running);
  } while($running > 0);


  // get content and remove handles
  foreach($curly as $id => $c) {
    $result[$id] = curl_multi_getcontent($c);
    curl_multi_remove_handle($mh,$c);
  }

  // all done
  curl_multi_close($mh);

  return $result;
}

?>

使用我使用的Web服务

<?php

$data = array(
  'http://search.yahooapis.com/VideoSearchService/V1/videoSearch?appid=YahooDemo&query=Pearl+Jam&output=json','http://search.yahooapis.com/ImageSearchService/V1/imageSearch?appid=YahooDemo&query=Pearl+Jam&output=json','http://search.yahooapis.com/AudioSearchService/V1/artistSearch?appid=YahooDemo&artist=Pearl+Jam&output=json'
);
$r = multiRequest($data);

echo '<pre>';
print_r($r);

?>

希望这可以帮助你:)

另请查看此答案here