fetch_multi_url.php

<?php
/**
 * fetch_multi_url
 *
 * @param array $urls URLの配列
 * @param integer $timeout タイムアウト秒数、default0秒（タイムアウトなし）
 * @return array 結果レスポンス一覧
 */
function fetch_multi_url( $urls, $timeout = 0 ){
  $mh = curl_multi_init();
  $conn = array();

  foreach( $urls as $i => $url) {
    $conn[$i] = curl_init( $url );
    curl_setopt( $conn[$i], CURLOPT_RETURNTRANSFER, true);
    curl_setopt( $conn[$i], CURLOPT_FAILONERROR, 1 );
    curl_setopt( $conn[$i], CURLOPT_FOLLOWLOCATION, 1 );
    curl_setopt( $conn[$i], CURLOPT_MAXREDIRS, 3 );
    curl_setopt( $conn[$i], CURLOPT_SSL_VERIFYPEER, false );
    curl_setopt( $conn[$i], CURLOPT_SSL_VERIFYHOST, false );
    if ( $timeout ){
      curl_setopt( $conn[$i], CURLOPT_TIMEOUT, $timeout );
    }
    curl_multi_add_handle( $mh, $conn[$i]);
  }

  $running = null;
  do {
    usleep( 10000 );
    curl_multi_exec( $mh, $running );
  } while( $running > 0 );

  $res = array();
  foreach( $urls as $i => $url ){
    $res[] = curl_multi_getcontent( $conn[$i] );
    curl_multi_remove_handle( $mh, $conn[$i] );
  }
  curl_multi_close($mh);

  return $res;
}

result.txt

1355813678
1355813681
1355813684
1355813687
---------------
Array
(
    [0] => 1355813691
    [1] => 1355813691
    [2] => 1355813691
    [3] => 1355813691
)

run.php

<?php
require_once 'fetch_multi_url.php';
$urls = array(
  'http://localhost/test.php?1',
  'http://localhost/test.php?2',
  'http://localhost/test.php?3',
  'http://localhost/test.php?4',
);

// 一個ずつ
foreach( $urls as $url ) {
  echo file_get_contents( $url ), "\n";
}

echo "---------------\n";

// まとめて
print_r( fetch_multi_url( $urls, 5) );

test.php

<?php
sleep(3);
echo time();