PHP DOMDocument loadHTML not encoding UTF-8 correctly

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DOMDocument::loadHTML will treat your string as being in ISO-8859-1 (the HTTP/1.1 default character set) unless you tell it otherwise. This results in UTF-8 strings being interpreted incorrectly.

If your string doesn’t contain an XML encoding declaration, you can prepend one to cause the string to be treated as UTF-8:

$profile="<p>イリノイ州シカゴにて、アイルランド系の家庭に、9</p>";
$dom = new DOMDocument();
$dom->loadHTML('<?xml encoding="utf-8" ?>' . $profile);
echo $dom->saveHTML();

If you cannot know if the string will contain such a declaration already, there’s a workaround in SmartDOMDocument which should help you:

$profile="<p>イリノイ州シカゴにて、アイルランド系の家庭に、9</p>";
$dom = new DOMDocument();
$dom->loadHTML(mb_convert_encoding($profile, 'HTML-ENTITIES', 'UTF-8'));
echo $dom->saveHTML();

This is not a great workaround, but since not all characters can be represented in ISO-8859-1 (like these katana), it’s the safest alternative.

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