php卷曲的资源限制

Question

我有一个页面，我从curl中检索许多网址中的内容。我发现在检索到一定数量的url后，curl返回null。 curl将在任何给定会话中检索的资源是否有限制。

我在检索每个网址之前执行curl_init()，在获取内容后执行curl_close()。我认为这将立即释放资源可以防止达到极限的情况。调用curl_init()次数有问题。

以下是我检索网址的PHP代码示例。

<?php
    function get_curl() {
        // Initialize a new curl resource
        $ch = curl_init(); 

        // Get only the content not the headers
        curl_setopt($ch, CURLOPT_HEADER, 0); 

        // Return the value instead of printing the response to browser
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

        // Use a user agent to mimic a browser
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0');

        return $ch;

        // Remember to always close the session and free all resources 
    }

    // Make sure curl is installed
    $curl_exists = function_exists('curl_init');
    if ( !$curl_exists ) {
        return;
    }

    $todayfeast = date("Ymd");

    $ctitleff = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=FR';
    $creadff = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading&lang=FR&content=FR';

    $ch = get_curl();
    curl_setopt($ch, CURLOPT_URL, $ctitleff);        
    $titleff = curl_exec($ch);
    curl_close($ch); 

    $ch = get_curl();
    curl_setopt($ch, CURLOPT_URL, $creadff);      
    $readff = curl_exec($ch);
    curl_close($ch);

    $ctitlepf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=PS';
    $creadpf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&&type=reading&lang=FR&content=PS';

    $ch = get_curl();
    curl_setopt($ch, CURLOPT_URL, $ctitlepf);    
    $titlepf = curl_exec($ch);
    curl_close($ch); 

    $ch = get_curl();
    curl_setopt($ch, CURLOPT_URL, $creadpf); 
    $readpf = curl_exec($ch);
    curl_close($ch);

    $titlesf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=SR';
    $readsf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading&lang=FR&content=SR';

    $ch = get_curl();
    curl_setopt($ch, CURLOPT_URL, $titlesf);  
    $titlesf = curl_exec($ch);
    curl_close($ch); 

    $ch = get_curl();
    curl_setopt($ch, CURLOPT_URL, $readsf); 
    $readsf = curl_exec($ch);
    curl_close($ch);

    $titlegf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=GSP';
    $readgf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading&lang=FR&content=GSP';

    $ch = get_curl();
    curl_setopt($ch, CURLOPT_URL, $titlegf); 
    $titlegf = curl_exec($ch);
    curl_close($ch); 

    $ch = get_curl();
    curl_setopt($ch, CURLOPT_URL, $readgf); 
    $readgf = curl_exec($ch);
    curl_close($ch); 

    // Send info
    $params = array(
        'titleff' => $titleff,
        'readff' => $readff,
        'titlepf' => $titlepf,
        'readpf' => $readpf,
        'titlesf' => $titlesf,
        'readsf' => $readsf,
        'titlegf' => $titlegf,
        'readgf' => $readgf,
    );

    echo json_encode($params);

?>

修改

问题只发生在我通过ajax调用这个php脚本时。

<script>
    $('#readingf').ready(function(){
    $.ajax({
        url: "loadfrench.php",
        type: "GET",
        data: { },
        cache: false,
        async: true,
        dataType: 'json',
        success: function (response) {
            if (response != '') 
            {
            $('#titleff').html(response.titleff);
            $('#readff').html(response.readff);
            $('#titlepf').html(response.titlepf);
            $('#readpf').html(response.readpf);
            $('#titlesf').html(response.titlesf);
            $('#readsf').html(response.readsf);
            $('#titlegf').html(response.titlegf);
            $('#readgf').html(response.readgf);
            alert ('titleff '+response.titleff+' readff '+response.readff);
            }
        },
        error: function (request, status, error) {
            alert ("status "+status+" error "+error+"responseText "+request.responseText);
        },
    });    

    });
</script>

如果我改为使用此文件，并在<?php require("filename.php") ?>的主页中加入，则可以正常使用。

<?php
    function get_curl() {
        // Initialize a new curl resource
        $ch = curl_init(); 

        // Get only the content not the headers
        curl_setopt($ch, CURLOPT_HEADER, 0); 

        // Return the value instead of printing the response to browser
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

        // Use a user agent to mimic a browser
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0');

        return $ch;

        // Remember to always close the session and free all resources 
    }

    // Make sure curl is installed
    $curl_exists = function_exists('curl_init');
    if ( !$curl_exists ) {
        return;
    }

    $ch = get_curl();

    $todayfeast = date("Ymd");
    /* $titleff = $readff = $titlepf = $readpf = $titlesf = $readsf = $titlegf = $readgf = "blank"; */

    $ctitleff = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=FR';
    $creadff = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading&lang=FR&content=FR';

    curl_setopt($ch, CURLOPT_URL, $ctitleff);        
    $titleff = curl_exec($ch);

    curl_setopt($ch, CURLOPT_URL, $creadff);      
    $readff = curl_exec($ch);

    $ctitlepf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=PS';
    $creadpf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&&type=reading&lang=FR&content=PS';

    curl_setopt($ch, CURLOPT_URL, $ctitlepf);    
    $titlepf = curl_exec($ch);

    curl_setopt($ch, CURLOPT_URL, $creadpf); 
    $readpf = curl_exec($ch);

    $titlesf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=SR';
    $readsf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading&lang=FR&content=SR';

    curl_setopt($ch, CURLOPT_URL, $titlesf);  
    $titlesf = curl_exec($ch);

    curl_setopt($ch, CURLOPT_URL, $readsf); 
    $readsf = curl_exec($ch);

    $titlegf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=GSP';
    $readgf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading&lang=FR&content=GSP';

    curl_setopt($ch, CURLOPT_URL, $titlegf); 
    $titlegf = curl_exec($ch);

    curl_setopt($ch, CURLOPT_URL, $readgf); 
    $readgf = curl_exec($ch);

    curl_close($ch); 

    // Send info
    $params = array(
        'titleff' => $titleff,
        'readff' => $readff,
        'titlepf' => $titlepf,
        'readpf' => $readpf,
        'titlesf' => $titlesf,
        'readsf' => $readsf,
        'titlegf' => $titlegf,
        'readgf' => $readgf,
    );

    echo json_encode($params);

?>


<?php
    $curl_exists = function_exists('curl_init');

    // Make sure curl is installed
    if ( $curl_exists ) {

        // Initialize a new curl resource
        $ch = curl_init(); 

        // Get only the content not the headers
        curl_setopt($ch, CURLOPT_HEADER, 0); 

        // Return the value instead of printing the response to browser
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

        // Use a user agent to mimic a browser
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0');

    }

?>

<div id="readfre" style="overflow:hidden;">
<div id="readingf" class="tabber" style="width:100%; margin-top: 10px; margin-right:0px;">

<?php 

    $todayfeast = date("Ymd");

    $ctitleff = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=FR';
    $creadff = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading&lang=FR&content=FR';

    if ( $curl_exists ) {
        curl_setopt($ch, CURLOPT_URL, $ctitleff);        
        $titleff = curl_exec($ch);
    }

    if ( $curl_exists ) {
        curl_setopt($ch, CURLOPT_URL, $creadff);      
        $readff = curl_exec($ch);
    }

?>
    <div id="readf" class="tabbertab">
        <h2>PremiËre Lecture</h2>
        <div id='titleff' class='rtitle'>
        <?php echo $titleff; ?>
        </div>
        <div id='readff' class='rtext'>
        <?php echo $readff; ?>
        </div>
    </div>

<?php

    $ctitlepf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=PS';
    $creadpf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&&type=reading&lang=FR&content=PS';

    if ( $curl_exists ) {
        curl_setopt($ch, CURLOPT_URL, $ctitlepf);    
        $titlepf = curl_exec($ch);
    }

    if ( $curl_exists ) {
        curl_setopt($ch, CURLOPT_URL, $creadpf); 
        $readpf = curl_exec($ch);
    }
?>  
    <div id="readp" class="tabbertab">
        <h2>Psaume</h2>
        <div id='titlepf' class='rtitle'>
        <?php echo $titlepf; ?>
        </div>
        <div id='readpf' class='rtext'>
        <?php echo $readpf; ?>
        </div>
    </div>

    <?php

        $titlesf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=SR';
        $readsf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading&lang=FR&content=SR';

        if ( $curl_exists ) {
            curl_setopt($ch, CURLOPT_URL, $titlesf);  
            $titlesf = curl_exec($ch);
        }

        if ( $curl_exists ) {
            curl_setopt($ch, CURLOPT_URL, $readsf); 
            $readsf = curl_exec($ch);
        }

    ?>
        <div id="reads" class="tabbertab">
            <h2>DeuxiËme Lecture</h2>
            <div id='titlesf' class='rtitle'>
            <?php echo $titlesf; ?>
            </div>
            <div id='readsf' class='rtext'>
            <?php echo $readsf; ?>
            </div>
        </div>

    <?php

        $titlegf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading_lt&lang=FR&content=GSP';
        $readgf = 'http://feed.evangelizo.org/reader.php?date='.$todayfeast.'&type=reading&lang=FR&content=GSP';

        if ( $curl_exists ) {
            curl_setopt($ch, CURLOPT_URL, $titlegf); 
            $titlegf = curl_exec($ch);
        }

        if ( $curl_exists ) {
            curl_setopt($ch, CURLOPT_URL, $readgf); 
            $readgf = curl_exec($ch);
        }

    ?>
        <div id="readg" class="tabbertab">
            <h2>Evangile</h2>
            <div id='titlegf' class='rtitle'>
            <?php echo $titlegf; ?>
            </div>
            <div id='readgf' class='rtext'>
            <?php echo $readgf; ?>
            </div>
        </div>

    <?php

        // Remember to always close the session and free all resources 
        if ( $curl_exists ) {
            curl_close($ch); 
        } 
    ?>

    </div>
    </div>

Answer 1

我不能确切地说出它为什么会发生，但是看到你从同一台服务器取出，我不会每次都创建一个新的curl句柄。只需使用相同的，只需更改CURLOPT_URL即可。这样，服务器将重用TCP连接，而不是每次都创建一个新连接：

$ch = get_curl();

curl_setopt($ch, CURLOPT_URL, $ctitleff);        
$titleff = curl_exec($ch);

curl_setopt($ch, CURLOPT_URL, $creadff);      
$readff = curl_exec($ch);

...

curl_close($ch);    

不确定这是一个答案，但是要尝试：）

另外，您可能需要查看curl-multi-exec()