从包含 html 的 php 文件中回显特定行答案

【问题标题】：Echo specific lines from php file containing html从包含 html 的 php 文件中回显特定行
【发布时间】：2018-05-02 10:21:43
【问题描述】：

我想更新网站的每个部分（页脚、页眉、贝宝表单等），而不是使用<?php readfile("http://www.website.com/footer.php");?>，我如何合并所有部分（如下所示）到一个 php文件，然后将该文件的特定行回显到 html 中。

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【问题讨论】：

你是说你想要一个包含$get_header、$get_article、$get_paypal_form和$get_kato函数的php文件吗？然后，您希望每个函数都回显它们的特定部分。最后你想要一个 include()？
这也确实有效！

标签： php html paypal echo

【解决方案1】：

您似乎希望使用 php 抓取 html 元素，然后将抓取的 html 元素保存到新的 html 文件中。执行此操作的一个好方法是使用 DomDocument 类和 xpath 查询来查找元素。然后创建一个新的 html 文档并将找到的元素附加到新文档中，并保存到文件中。例如：

<?
//create array of element tags to be scraped from target url
$elements = ["header", "div"];
//get html from target url
$html = file_get_contents('http://www.nytimes.com');

//instantiate new instance DOMDocument for target html.
$dom = new DOMDocument();
libxml_use_internal_errors(TRUE); //disable libxml errors
$dom->loadHTML($html);
libxml_clear_errors();
//instantiate DOMXPath for the ability to do xpath queries.
//xpath is powerful for this example using basic query can be used to query by class id etc
//DOMDocument powerful too. Read documents here: http://php.net/manual/en/class.domdocument.php
$xpath = new DOMXPath($dom);

//instantiate DOMDocument for new HTML document where founds elements from target will be saved to.
$new_dom = new DOMDocument();
$new_dom->formatOutput = true;
//save basic html element to document
$new_dom->loadXML("<html></html>");
$new_dom->saveXML();

//iterate over $elements array
foreach($elements as $element){
    //query by xpath for the element
    $element_node = $xpath->query("//".$element);
    //iterate over found elements and add to the new html document
    foreach($element_node as $row){
        $node = $new_dom->importNode($row, true);
        $new_dom->documentElement->appendChild($node);
        $new_dom->saveXML();
    }
}
//save found elements to new html document
$new_dom->save('test.html');

【讨论】：

对我来说全新的不同世界，但答案是有效的，有助于进一步了解可能性。谢谢。
没问题！乐于助人。