如何用PHP高效采集新闻列表及详情,并解决相对路径和内容提取难题?

如何用php高效采集新闻列表及详情,并解决相对路径和内容提取难题?

利用PHP高效采集新闻列表及详情,巧妙解决相对路径和内容提取难题

本文将详细讲解如何运用PHP、cURL和正则表达式,从目标网站高效采集新闻列表和新闻详情,并重点解决相对路径和内容提取的常见问题。

首先,我们需要获取新闻列表页面的HTML内容。可以使用cURL函数,将目标网站的列表页URL(例如:http://www.example.com/news)作为参数传入,即可获取页面源代码。

挑战一:处理相对路径的新闻链接

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列表页的新闻链接通常是相对路径,例如/article/40958.html。为了得到完整的URL,需要将网站域名与相对路径拼接。虽然可以使用正则表达式href="https://www.php.cn/link/01bebc8e971d09cb90cf5756b340f24c"提取链接,但这仅获取相对路径。我们需要在PHP中进行进一步处理:

$html = curl_exec($ch); // 获取页面HTML内容preg_match_all('/<as+href="https://www.php.cn/link/01bebc8e971d09cb90cf5756b340f24c"/i', $html, $matches); // 提取所有标签中的链接$news_links = [];$base_url = 'http://www.example.com'; //  替换为目标网站域名foreach ($matches[1] as $relative_path) {    $absolute_url = $base_url . ($relative_path[0] == '/' ? $relative_path : '/' . $relative_path); // 拼接完整URL    $news_links[] = $absolute_url;}```这段代码首先使用正则表达式提取所有``标签中的链接,然后遍历提取的相对路径,将其与网站域名拼接成完整的URL,存储到`$news_links`数组中。**挑战二:高效提取新闻详情页内容**接下来,遍历`$news_links`数组中的每个链接,再次使用cURL获取新闻详情页的HTML内容,并提取新闻标题和内容。```phpforeach ($news_links as $news_link) {    curl_setopt($ch, CURLOPT_URL, $news_link);    $detail_html = curl_exec($ch);    // 提取新闻标题 (需要根据实际HTML结构调整正则表达式)    preg_match('/(.*?)/i', $detail_html, $title_match);    $title = isset($title_match[1]) ? $title_match[1] : '';    // 提取新闻内容 (需要根据实际HTML结构调整正则表达式)    preg_match('/<div class="content text-xs">https://www.php.cn/link/01bebc8e971d09cb90cf5756b340f24c/is', $detail_html, $content_match);    $content = isset($content_match[1]) ? strip_tags($content_match[1]) : ''; // 使用strip_tags清除HTML标签    // 输出新闻标题、完整路径和内容    echo "标题: " . $title . "<br>";    echo "链接: " . $news_link . "<br>";    echo "内容: " . $content . "<br><br>";}</pre>
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<p>这段代码遍历每个新闻链接,获取详情页HTML,使用正则表达式提取内容和标题(注意:标题和内容的正则表达式需要根据实际HTML结构调整)。<code>strip_tags()</code>函数用于清除HTML标签,得到纯文本内容。最后,将提取的信息输出。  <code>/is</code>修饰符中的<code>s</code>允许<code>.</code>匹配换行符。</p>
<p><strong>总结:</strong></p>
<p>本方法使用cURL和正则表达式实现了新闻采集。  然而,对于复杂的HTML结构,建议使用DOM解析器(例如DOMDocument)以提高代码的可读性和维护性,并减少正则表达式出错的风险。  请务必根据目标网站的HTML结构调整正则表达式。  记住替换<code>'http://www.example.com'</code>为实际的目标网站域名。</p>
<p>以上就是如何用PHP高效采集新闻列表及详情,并解决相对路径和内容提取难题?的详细内容,更多请关注创想鸟其它相关文章!</p>
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                                    <span class="item-meta-li date">2025年12月10日</span>
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                                 php源码和编译的六个步骤区别 php源码与编译步骤的详细对比            </a>
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                                    <span class="item-meta-li date">2025年12月10日</span>
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                                 PHP函数可以有多个返回值吗?            </a>
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                                    <span class="item-meta-li date">2025年12月10日</span>
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                                 PHP中如何实现数组去重?            </a>
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            <p>在php中实现数组去重可以使用以下方法:1. 使用array_unique函数,简单高效,但处理复杂数据结构时需注意。2. 结合array_filter和array_reduce函数,自定义去重逻辑,灵活但性能较低。3. 使用foreach循环手动去重,适合需要同时执行其他操作的情况,但性能较差。 …</p>
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                                    <span class="item-meta-li date">2025年12月10日</span>
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                                 PHP中如何实现数组反序列化?            </a>
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        <div class="item-excerpt">
            <p>在PHP中实现数组反序列化,首先我们得明白序列化和反序列化是啥意思。序列化就是把一个复杂的数据结构转换成一个可以存储或传输的格式,而反序列化就是把这个格式再转回原来的数据结构。在PHP中,序列化和反序列化主要通过serialize()和unserialize()函数来实现。 当我们谈到数组反序列化时…</p>
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                                    <span class="item-meta-li date">2025年12月10日</span>
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                <span class="item-meta-li views" title="阅读数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-eye"></use></svg></i>0</span><a class="item-meta-li comments" href="https://www.chuangxiangniao.com/p/1257363.html#comments" target="_blank" title="评论数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-comment"></use></svg></i>0</a><span class="item-meta-li stars" title="收藏数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-star"></use></svg></i>0</span><span class="item-meta-li likes" title="点赞数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-thumb-up"></use></svg></i>0</span>            </div>
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<li class="item item2">
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                                 PHP中箭头函数怎么用?            </a>
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            <p>php中的箭头函数是一种简洁的函数语法,引入于php 7.4版本。箭头函数的使用场景通常是当需要简短、一次性的函数时,特别是在处理数组或数据流时。箭头函数的语法为$fn = fn($arg1, $arg2) => expression,具有自动捕获当前作用域变量的特点,无需使用use关键字。箭…</p>
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                                    <span class="item-meta-li date">2025年12月10日</span>
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                <span class="item-meta-li views" title="阅读数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-eye"></use></svg></i>0</span><a class="item-meta-li comments" href="https://www.chuangxiangniao.com/p/1257361.html#comments" target="_blank" title="评论数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-comment"></use></svg></i>0</a><span class="item-meta-li stars" title="收藏数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-star"></use></svg></i>0</span><span class="item-meta-li likes" title="点赞数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-thumb-up"></use></svg></i>0</span>            </div>
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            <img width="480" height="300" src="https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png" class="attachment-default size-default wp-post-image j-lazy" alt="PHP中__construct和__destruct有什么用?" decoding="async" data-original="https://cdn.chuangxiangniao.com/www/2025/12/174593826899408.jpg?imageMogr2/crop/480x300/gravity/center" />        </a>
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                                 PHP中__construct和__destruct有什么用?            </a>
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        <div class="item-excerpt">
            <p>在php中,__construct用于对象初始化,__destruct用于资源清理。1. __construct在对象实例化时自动调用,初始化对象属性。2. __destruct在对象销毁时自动调用,确保资源如文件句柄被正确关闭。 在PHP中,__construct和__destruct是两个非常重…</p>
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                    <img alt='程序猿的头像' src='//cdn.chuangxiangniao.com/www/2025/10/2025102208472691.jpg' class='avatar avatar-60 photo' height='60' width='60' />                    <span>程序猿</span>
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                                    <span class="item-meta-li date">2025年12月10日</span>
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                <span class="item-meta-li views" title="阅读数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-eye"></use></svg></i>0</span><a class="item-meta-li comments" href="https://www.chuangxiangniao.com/p/1257359.html#comments" target="_blank" title="评论数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-comment"></use></svg></i>0</a><span class="item-meta-li stars" title="收藏数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-star"></use></svg></i>0</span><span class="item-meta-li likes" title="点赞数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-thumb-up"></use></svg></i>0</span>            </div>
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            <img width="480" height="300" src="https://www.chuangxiangniao.com/wp-content/themes/justnews/themer/assets/images/lazy.png" class="attachment-default size-default wp-post-image j-lazy" alt="PHP中如何实现部分应用?" decoding="async" data-original="https://cdn.chuangxiangniao.com/www/2025/12/174594096564841.jpg?imageMogr2/crop/480x300/gravity/center" />        </a>
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            <a href="https://www.chuangxiangniao.com/p/1257357.html" target="_blank" rel="bookmark">
                                 PHP中如何实现部分应用?            </a>
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        <div class="item-excerpt">
            <p>在php中,可以通过匿名函数和closure::bind实现部分应用。1) 使用匿名函数预先填充参数,如$addfive = function($b) use ($a = 5) { return add($a, $b);};2) 使用closure::bind动态绑定,如$boundclosure …</p>
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                                    <span class="item-meta-li date">2025年12月10日</span>
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                <span class="item-meta-li views" title="阅读数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-eye"></use></svg></i>0</span><a class="item-meta-li comments" href="https://www.chuangxiangniao.com/p/1257357.html#comments" target="_blank" title="评论数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-comment"></use></svg></i>0</a><span class="item-meta-li stars" title="收藏数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-star"></use></svg></i>0</span><span class="item-meta-li likes" title="点赞数"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-thumb-up"></use></svg></i>0</span>            </div>
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                                 PHP中如何验证日期时间字符串?            </a>
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            <p>在php中,可以使用datetime类或strtotime函数验证日期时间字符串。1) 使用datetime::createfromformat方法,确保格式化后的日期与原始字符串匹配。2) 使用strtotime函数,检查返回的时间戳是否大于0。 在PHP中验证日期时间字符串是一项常见的任务,特别…</p>
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