Why is my PHP DOMDocument::loadHTML() not handling UTF-8 correctly?

PHP DOMDocument loadHTML Not Encoding UTF-8 Correctly

Problem:

When parsing HTML with PHP's DOMDocument::loadHTML(), UTF-8 characters are not interpreted correctly, leading to distorted output.

Cause:

DOMDocument assumes the input string is in ISO-8859-1 encoding by default. However, UTF-8 is commonly used in HTML5. When loading UTF-8 strings without specifying the encoding, DOMDocument misinterprets them.

Solution:

To address this issue, you need to specify the correct encoding for the input string. You have several options:

• Prepend an XML encoding declaration: Add an declaration to the beginning of the string.
• Use a meta charset declaration: Add a tag to the section of the document.
• Use the SmartDOMDocument library: This library works around the issue by converting the string to HTML entities before loading it into DOMDocument.
• Use the mb_encode_numericentity() function: This function converts UTF-8 characters to their HTML entity equivalents, which DOMDocument can then parse correctly.

Example:

This code demonstrates using the mb_encode_numericentity() function:

$profile = '<p>イリノイ州シカゴにて、アイルランド系の家庭に</p>';
$dom = new DOMDocument();
$dom->loadHTML(mb_encode_numericentity($profile, [0x80, 0x10FFFF, 0, ~0], 'UTF-8'));
echo $dom->saveHTML();

By using these techniques, you can ensure that UTF-8 characters are parsed and displayed correctly in your PHP DOMDocument.

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