# DOMDocument::save

(PHP 5, PHP 7, PHP 8)

DOMDocument::save — Dumps the internal XML tree back into a file

### 说明

public DOMDocument::save(string `$filename`, int `$options` = 0): int|false

Creates an XML document from the DOM representation. This function is usually called after building a new dom document from scratch as in the example below.

### 参数

`filename`

  The path to the saved XML document.

`options`

  Additional Options. Currently only LIBXML_NOEMPTYTAG is supported.

### 返回值

Returns the number of bytes written or `false` if an error occurred.

### 示例

示例 #1 Saving a DOM tree into a file

`<?php
$doc = new DOMDocument('1.0');
// we want a nice output
$doc->formatOutput = true;
$root = $doc->createElement('book');
$root = $doc->appendChild($root);
$title = $doc->createElement('title');
$title = $root->appendChild($title);
$text = $doc->createTextNode('This is the title');
$text = $title->appendChild($text);
echo 'Wrote: ' . $doc->save("/tmp/test.xml") . ' bytes'; // Wrote: 72 bytes
?>`

### 参见

- DOMDocument::saveXML() - Dumps the internal XML tree back into a string
- DOMDocument::load() - Load XML from a file
- DOMDocument::loadXML() - Load XML from a string

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