PHP fopen forloops

Question

我不太确定为什么这不起作用，我试着用谷歌搜索，看看是否有答案，他们中的很多人想出了一个foreachloop而不是常规的for循环，有人能解释一下为什么这不起作用吗？

<?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>";

    }
?>

我希望它能打印3次google信息，但如果我自己打开它，它就不能打印3次，但如果我多次打印，它就不能做我所期望的任何事情

输出ex

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

Answer 1

为什么不使用foreach呢？

<?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：

你可能还会感兴趣地知道，使用fopen进行循环大约比使用curl_multi慢4.6倍，因为curl multi会同时发出所有请求，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秒内完成多次卷曲吗

<?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
?> 

在2.3253791332245秒内完成了fopen()

<?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 
?>

希望能有所帮助

Answer 2

$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/>";
}