php curl 在一个本地主机上工作，但在其他本地主机上不工作

Question

我收到客户的订单，要求使用 php curl 抓取网站。我完成了这项工作，并且脚本在我的本地主机上运行良好。但是当我把它交给我的客户端脚本时，它无法在他的本地主机上运行。

<?php

ini_set('display_errors', 'On');
error_reporting(E_ALL);

print "Cascading https://www.autotrader.ca/cars/on/toronto/?rcp=15&rcs=0&prx=100&prv=Ontario&loc=toronto%2C%20on&hprc=True&wcp=True&sts=New-Used&inMarket=basicSearch&mdl=Accent&make=Hyundai&scrladid=11543266:<p>";

$array = [];
$array[] = "/a/hyundai/accent/oshawa/ontario/19_11543266_/?showcpo=ShowCpo&amp;ncse=no&amp;orup=1_15_340&amp;sprx=100";
$array[] = "/a/hyundai/accent/cambridge/ontario/5_48590586_20200220145456261/?showcpo=ShowCpo&amp;ncse=no&amp;orup=2_15_340&amp;sprx=100";
$array[] = "/a/hyundai/accent/mississauga/ontario/19_11536424_/?showcpo=ShowCpo&amp;ncse=no&amp;orup=3_15_340&amp;sprx=100";

foreach ($array as $key=>$value)
{
    $scrape = "https://www.autotrader.ca".$array[$key];
    print "Scraping $scrape<p>";
    echo "<br>";

    $user_agent = 'Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Mobile Safari/537.36';

    $headers = [
        'accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
        'accept-encoding: gzip, deflate, br',
        'accept-language: en-US,en;q=0.9',
        'cache-control: max-age=0',
        'sec-fetch-dest: document',
        'sec-fetch-mode: navigate',
        'sec-fetch-site: none',
        'sec-fetch-user: ?1',
        'upgrade-insecure-requests: 1',
        'user-agent: Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Mobile Safari/537.36',
    ];
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $scrape);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 15);
    curl_setopt($ch, CURLOPT_TIMEOUT, 100);
    curl_setopt($ch, CURLOPT_ENCODING, 1);
    curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_VERBOSE, true);
    // curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Length: 0'));
    curl_setopt($ch, CURLOPT_COOKIEJAR, dirname(__FILE__) . '/cookie.txt');
    curl_setopt($ch, CURLOPT_COOKIEFILE, dirname(__FILE__) . '/cookie.txt');

    $contents = curl_exec($ch);
    
    if ($contents === FALSE){
        echo "Error : ".curl_error($ch);
        echo "<br>";
        print "contents returned for $key = FALSE<br>";
    }

    curl_close($ch);
    
    // echo $contents;

    $start_pos = strpos($contents, "<title>", 0);
    $end_pos = strpos($contents, "</title>", 0);
    $title = substr($contents, $start_pos+7, $end_pos-$start_pos);
    
    print "Listing $key: $title<p>";
    echo "<br>";
    echo "<br>";
}

他还告诉我，他之前没有使用curl而是使用任何其他方法来抓取网站，他认为他们已经将他的请求限制在他们的服务器上，但请注意，他仍然可以在浏览器中访问该网站。我检查了如果他在curl中将url替换为google url，他能够得到正确的响应。

Answer 1

这里最可能的问题是您的客户端安装的 PHP 没有安装或启用 php-curl 扩展。根据您的操作系统和 PHP 的安装方式，实现方式有所不同，但以下是一些常见情况：

对于 Ubuntu 或其他 基于 Debian 的 Linux 发行版：

apt-get install php7.4-curl
systemctl restart apache2

将“7.4”替换为您当前在第一个命令中使用的 PHP 版本

对于 Windows 上的 WAMP： 如何在Wamp服务器中启用curl

对于 Windows 上的 XAMPP： 如何在 PHP / XAMPP 中启用 cURL

Answer 2

在代理后面运行它，工作正常。简化并纠正了一些小错误。

尝试这个，不要忘记评论/编辑 CURLOPT_PROXY 行。

<?php
ini_set('display_errors', 'On');
error_reporting(E_ALL);

$array = [
    "/a/hyundai/accent/oshawa/ontario/19_11543266_/?showcpo=ShowCpo&amp;ncse=no&amp;orup=1_15_340&amp;sprx=100",
    "/a/hyundai/accent/cambridge/ontario/5_48590586_20200220145456261/?showcpo=ShowCpo&amp;ncse=no&amp;orup=2_15_340&amp;sprx=100",
    "/a/hyundai/accent/mississauga/ontario/19_11536424_/?showcpo=ShowCpo&amp;ncse=no&amp;orup=3_15_340&amp;sprx=100"
];

foreach ($array as $key => $value) {
    $scrape = "https://www.autotrader.ca" . $value;
    echo "Scraping " . $scrape . "<br>\n";
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $scrape);
    curl_setopt($ch, CURLOPT_PROXY, "http://<proxy_url>:80"); // Comment if not behind a proxy
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_COOKIEJAR, dirname(__FILE__) . '/cookie.txt');
    curl_setopt($ch, CURLOPT_COOKIEFILE, dirname(__FILE__) . '/cookie.txt');
    $contents = curl_exec($ch);

    if (curl_error($ch)) {
        echo "Error : " . curl_error($ch) . "<br>\n";
        break;
    }
    curl_close($ch);

    $title = explode("<title>", $contents);
    $title = explode("</title>", $title[1]);
    $title = $title[0];

    echo "Listing " . $key . ": " . $title . "<br>\n";
    echo "<br>\n";
    echo "<br>\n";
}