Serializes the document as an HTML file

# Dom\HTMLDocument::saveHtmlFile

(PHP 8 >= 8.4.0)

Dom\HTMLDocument::saveHtmlFile — Serializes the document as an HTML file

### Description

public Dom\HTMLDocument::saveHtmlFile(string `$filename`): int|false

Serializes the document as an HTML file.

### Parameters

`filename`
  The path to the file to save to.

### Return Values

The number of bytes written on success, or `false` on failure.

### Errors/Exceptions

- Throws a ValueError if `filename` is an empty string or contains any null bytes.

### See Also

- Dom\HTMLDocument::saveHtml() - Serializes the document as an HTML string
- Dom\HTMLDocument::saveXmlFile() - Serializes the document as an XML file

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