(PHP 8 >= 8.4.0)
Dom\HTMLDocument::saveHtmlFile — Serializes the document as an HTML file
public Dom\HTMLDocument::saveHtmlFile(string $filename): int|false
Serializes the document as an HTML file.
filename The number of bytes written on success, or false on failure.
filename is an empty string or contains any null bytes.
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https://www.php.net/manual/en/dom-htmldocument.savehtmlfile.php