I got a task to update specific parts of HTML elements across all pages of a web project. Given the size and complexity of the project, I prefer using DOM manipulation over methods like regex to ensure more structured changes. However, as I'm a beginner in DOM manipulation and am handling real data, I have some concerns.
My main concern is ensuring that only the intended parts of the HTML are modified, while other parts of the document remain unchanged. I want to verify and prevent if any unintended changes are made implicitly by the DOM parser during manipulation. This is crucial for data integrity and preventing accidental modifications in the rest of the document.
So far, I've also noticed that PHP's DOMDocument class converts all HTML tag names to lowercase by default when parsing HTML, which is fine.
$html = '
<!DOCTYPE html>
<html>
<head>
<title>My Web Page</title>
</head>
<body>
"This Line Non Tag TextNode Before header"
<h1 id="main-header" class="header">Main Header</h1>
<div class="content">
<h1 class="nested-header">Nested Header 1</h1>
<p>Some content under nested header.</p>
<a href=";>Example Link</a>
</div>
<h2 id="sub-header-1">Sub Header 1</h2>
<h3>Sub Header 2</h3>
<h1>Another Main Header</h1>
<p>This is a paragraph outside the header tags.</p>
<footer>Some footer text with <span>inline text</span>.</footer>
</body>
</html>';
// Load HTML content
$doc = new DOMDocument();
@$doc->loadHTML($html);
// Create a TextNode to be inserted before the first <h1>
$textNode = $doc->createTextNode('This Line Non Tag TextNode Before header');
// Insert the TextNode before the first <h1> element
$firstHeader = $doc->getElementsByTagName('h1')->item(0);
if ($firstHeader) {
$firstHeader->parentNode->insertBefore($textNode, $firstHeader);
}
// Remove the first <h1> element
if ($firstHeader) {
$firstHeader->parentNode->removeChild($firstHeader);
}
// Check if other headers or elements are modified unintentionally
$modifiedHtml = $doc->saveHTML();
echo $modifiedHtml;