(PHP 5, PHP 7)
DOMDocument::save — Dumps the internal XML tree back into a file
public DOMDocument::save ( string $filename [, int $options = 0 ] ) : int
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.
filename
The path to the saved XML document.
options
Additional Options. Currently only LIBXML_NOEMPTYTAG is supported.
Returns the number of bytes written or false if an error occurred.
Example #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
?>
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https://www.php.net/manual/en/domdocument.save.php