0

我不完全确定为什么这不起作用我尝试用谷歌搜索它是否有答案很多他们想出了一个 foreachloop 而不是常规的 for 循环有人可以向我解释为什么这不起作用。

<?php
$list = array("GOOG", "AAP", "MSFT");

    for($i=0; $i<3; $i++)
    {
        echo "why isn't this working <br>";

        $fp = fopen ("http://finance.yahoo.com/d/quotes.csv?s=GOOG&f=sl1ve1x&e=.csv","r");
        $data = fgetcsv ($fp, 1000, ",");
        $exit = str_replace('"',"",$data[3]);
        $exchange = str_replace('"',"",$data[4]);

        echo "$data[0] <br>";
        echo "$data[1] <br>";
        echo "$data[2] <br>";

    }
?>

我希望它打印谷歌信息 3 次，如果我在它工作后自行取出 fopen 则不会，但如果我多次这样做，它就不会做任何我期望的事情

输出前

why isn't this work
Goog
8398
789
why isn't this work
Goog
8398
789
why isn't this work
Goog
8398
789
4

2 回答 2

2

为什么不使用 foreach？

<?php
$lists = array("GOOG", "AAP", "MSFT");

foreach($lists as $list)
{
    echo "<h3>Values for ".$list."</h3>";

    $fp = fopen ("http://finance.yahoo.com/d/quotes.csv?s=".$list."&f=sl1ve1x&e=.csv","r");
    $data = fgetcsv ($fp, 1000, ",");
    fclose($fp);

    echo $data[0]."<br/>",
         $data[1]."<br/>",
         $data[2]."<br/>";
}
/* Result
Values for GOOG
GOOG
681.72
1582936
Values for AAP
AAP
80.44
1306227
Values for MSFT
MSFT
29.86
43408272
*/
?>

编辑：

您可能还想知道，使用 fopen 循环大约慢 4.6 倍，然后使用 curl_multi 作为 curl multi 将同时发出所有请求，结果如下：

简单卷曲多功能：

<?php
function curl_multi_get($data) {
    $curly = array();
    $result = array();

    $mh = curl_multi_init();
    foreach ($data as $id=>$d) {
        $curly[$id] = curl_init();
        curl_setopt($curly[$id], CURLOPT_URL,            'http://finance.yahoo.com/d/quotes.csv?s='.$d.'&f=sl1ve1x&e=.csv');
        curl_setopt($curly[$id], CURLOPT_HEADER,         0);
        curl_setopt($curly[$id], CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curly[$id], CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($curly[$id], CURLOPT_TIMEOUT,        30);
        curl_setopt($curly[$id], CURLOPT_AUTOREFERER,    true);
        curl_setopt($curly[$id], CURLOPT_RETURNTRANSFER, true);

        curl_multi_add_handle($mh, $curly[$id]);
    }
    $running = null;
    do {
        curl_multi_exec($mh, $running);
    } while($running > 0);
    foreach($curly as $id => $c) {
        $result[$id] = curl_multi_getcontent($c);
        curl_multi_remove_handle($mh, $c);
    }
    curl_multi_close($mh);
    return $result;
}
?>

在0.50315880775452秒内卷曲多

<?php
//Benchmark test 1 curl_multi
$time_start = microtime(true);
//---------------------------------------

$lists  = array("GOOG", "AAP", "MSFT");
$result = curl_multi_get($lists);

foreach($result as $data)
{
    $data = explode(',',$data);

    echo "<h3>Values for ".$data[0]."</h3>";

    echo $data[0]."<br/>",
         $data[1]."<br/>",
         $data[2]."<br/>";
}

//--------------------------------------
$time_end = microtime(true);
$time = $time_end - $time_start;

echo "Did Curl multi in $time seconds\n";
//end first test
//Did Curl multi in 0.50315880775452 seconds
?>

fopen() 在2.3253791332245秒内

<?php
//Benchmark test 2 fopen()
$time_start = microtime(true);
//--------------------------------------

$lists = array("GOOG", "AAP", "MSFT");
foreach($lists as $list)
{
    echo "<h3>Values for ".$list."</h3>";

    $fp = fopen ("http://finance.yahoo.com/d/quotes.csv?s=".$list."&f=sl1ve1x&e=.csv","r");
    $data = fgetcsv ($fp, 1000, ",");
    fclose($fp);

    echo $data[0]."<br/>",
         $data[1]."<br/>",
         $data[2]."<br/>";
}

//--------------------------------------
$time_end = microtime(true);
$time = $time_end - $time_start;

echo "Did fopen() in $time seconds\n";
//end second test
//Did fopen() in 2.3253791332245 seconds 
?>

希望能帮助到你

于 2012-11-07T06:44:03.930 回答
0 
$lists  = array("GOOG", "AAP", "MSFT");
$result = curl_multi_get($lists);

foreach($result as $data)
{
    $data = explode(',',$data);

    echo "<h3>Values for ".$data[0]."</h3>";

    echo $data[0]."<brtextmessagedfghjkljhgfdsadfghjkkjhgfdsasdfghjklkjhgfdsasdfghjkkjhgfdsasdfghjkjhgfdsdfghjkkjhgfdsdfghjm,.,mnbvcxsdfghjklkjhgfdsdfghjkllkjhgfdsa/>",
         $data[1]."<br/>",
         $data[2]."<br/>";
}
于 2013-04-26T00:53:16.487 回答