php wiki 爬虫出现错误

Question

在下面的代码中，我尝试使用 php 代码从网站中提取内容，当我使用 getElementByIdAsString('www.abebooks.com/9780143418764/Love-Story-Singh-Ravinder-0143418769/plp', 'synopsis') 时它工作正常；

但是当我使用相同的代码从维基百科中提取内容时它不起作用，getElementByIdAsString('https://en.wikipedia.org/wiki/A_Brief_History_of_Time', 'Summary');

下面是我的代码和我在使用后者时遇到的异常 one.Can 有人更正了我的代码以根据 id

提取维基百科内容

提前致谢。

<?php


function getElementByIdAsString($url, $id, $pretty = true) {
    $doc = new DOMDocument();

    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    $result = curl_exec($ch);


//    var_dump($doc->loadHTMLFile($url)); die;
error_reporting(E_ERROR | E_PARSE);
    if(!$result) {
        throw new Exception("Failed to load $url");
    }
    $doc->loadHTML($result);
    // Obtain the element
    $element = $doc->getElementById($id);

    if(!$element) {
        throw new Exception("An element with id $id was not found");
    }

    if($pretty) {
        $doc->formatOutput = true;
    }

    // Return the string representation of the element
    return $doc->saveXML($element);
}

//Here I am dispalying the output in bold text
echo getElementByIdAsString('https://en.wikipedia.org/wiki/A_Brief_History_of_Time', 'Summary');

?>

异常

Fatal error: Uncaught exception 'Exception' with message 'Failed to load http://en.wikipedia.org/wiki/A_Brief_History_of_Time' in C:\xampp\htdocs\example2.php:18 Stack trace: #0 C:\xampp\htdocs\example2.php(40): getElementByIdAsString() #1 {main} thrown in C:\xampp\htdocs\example2.php on line 18

你的帮助将非常有用:-)

Answer 1

尝试添加：

curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

评论讨论后更新：

<?php

function getElementByIdAsString($url, $id, $pretty = true) {
    $doc = new DOMDocument();

    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

    $result = curl_exec($ch);

    error_reporting(E_ERROR | E_PARSE);
    if(!$result) {
        throw new Exception("Failed to load $url");
    }
    $doc->loadHTML($result);
    // Obtain the element
    $element = $doc->getElementById($id);

    if(!$element) {
        throw new Exception("An element with id $id was not found");
    }

    if($pretty) {
        $doc->formatOutput = true;
    }

    $output = '';
    $node = $element->parentNode;

    while(true) {
        $node = $node->nextSibling;
        if(!$node) {
            break;
        }
        if($node->nodeName == 'p') {
            $output .= $node->nodeValue;
        }
        if($node->nodeName == 'h2') {
            break;
        }
    }

    return $output;
}

//Here I am dispalying the output in bold text
var_dump(getElementByIdAsString('https://en.wikipedia.org/wiki/A_Brief_History_of_Time', 'Summary'));

您可能也可以使用 xPaths 或只使用整个响应并使用正则表达式剪切任何您想要的内容

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