使用PHP DOM 以粗体格式更改标题和其他字符串修改

Question

<?php
$data = 'THE CORRECT ANSWER IS C.
<p>Choice A Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since the 1500s</p>
<p></p>
<p>Choice B Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since the 1500s</p>
<p>Choice D Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since the 1500s</p>
<p></p>
<p>Choice E simply dummy text of the printing and typesetting industry.</p>
<p></p>
<p><br>THIS IS MY MAIN TITLE IN CAPS<br>This my sub title.</p>
<p><br>TEST ABC: Lorem Ipsum is simply dummy text of the printing and typesetting industry.</p>
<p>1) It is a long established fact <140/90 mmHg OR <130/80 mmHg making it look like readable English will uncover many web sites still in their infancy. 
<br><br>2) There are many variations of passages of Lorem Ipsum available. </p>
<p><br>TEST XYZ: Lorem Ipsum has been the industrys standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.</p>
<p><br>TES T TEST: It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged.</p>
<p><br>TESTXXX: It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>';

$dom = new DOMDocument();
@$dom->loadHTML($data, LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
foreach ($xpath->query('//text()') as $node) {
    $txt = trim($node->nodeValue);
    $p   = $node->parentNode;
    if (preg_match("/^\s*(TEST ABC:|TEST XYZ:|TES T TEST:|TESTXXX)(.*)$/s", $node->nodeValue, $matches)) {
        // Put Choice X in bold:
        $p->insertBefore($dom->createElement('strong', $matches[1]), $node);
        $node->nodeValue = " " . trim($matches[2]);
    } else if (strtoupper($txt) === $txt && $txt !== '') {
        // Put header in bold
        $p->insertBefore($dom->createElement('strong', $txt), $node);
        $node->nodeValue = "";
    }
}
$data = $dom->saveHTML();
echo $data;

我已经尝试了第 1 点，第 2 点工作正常只需要解决第 3 个问题：

加粗的标题："THIS IS MY MAIN TITLE IN CAPS"（标题并不总是相同的）
加粗的词：TEST ABC:、TEST XYZ:、TES T TEST:、TESTXXX:（这些词总是相同的）
当您运行此代码时，有些字符串没有显示跳行（在字符串 forex 中减少和增加：<140/90 mmHg 或 <130/80 mmHg）。

Answer 1

echo preg_replace('/(THIS IS MY MAIN TITLE IN CAPS)/', '<strong></strong>', $data);

Preg_replace 语法：preg_replace(regex, replace, subject)

$1 将在正则表达式

的括号内显示捕获的标题

Answer 2

正则表达式确实可以用来处理这个问题，但通常建议通过 DOM 执行 HTML 操作。 PHP 的 DOMDocument 提供了这个。

然后您可以使用这段代码，它遍历所有文本节点并查看是否满足两个条件中的任何一个：

文本以预定义列表中的单词开头
文字全部大写

在这两种情况下，都会使用该内容创建一个新的 strong 节点，并相应地调整原始节点。

$dom = new DOMDocument();
$dom->loadHTML($data, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
foreach($xpath->query('//text()') as $node) {
    $txt = trim($node->nodeValue);
    $p = $node->parentNode;
    if (preg_match("/^\s*(TEST ABC:|TEST XYZ:|TES T TEST:|TESTXXX)(.*)$/s", $node->nodeValue, $matches)) {
        // Put Choice X in bold:
        $p->insertBefore($dom->createElement('strong', $matches[1]), $node);
        $node->nodeValue = " " . trim($matches[2]);
    } else if (strtoupper($txt) === $txt && $txt !== '') {
        // Put header in bold
        $p->insertBefore($dom->createElement('strong', $txt), $node);
        $node->nodeValue = "";
    }
}
$data = $dom->saveHTML();

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使用PHP DOM 以粗体格式更改标题和其他字符串修改

Using PHP DOM to change title in bold format and other string modifications

php

regex

dom

preg-replace

preg-match