PHP XML how to output nice format

You can try to do this:

...// get completed xml document$doc->preserveWhiteSpace = false;$doc->formatOutput = true;$xml_string = $doc->saveXML();echo $xml_string;

You can make set these parameter right after you've created the DOMDocument as well:

$doc = new DomDocument('1.0');$doc->preserveWhiteSpace = false;$doc->formatOutput = true;

That's probably more concise. Output in both cases is (Demo):

<?xml version="1.0"?><root>  <error>    <a>eee</a>    <b>sd</b>    <c>df</c>  </error>  <error>    <a>eee</a>    <b>sd</b>    <c>df</c>  </error>  <error>    <a>eee</a>    <b>sd</b>    <c>df</c>  </error></root>

I'm not aware how to change the indentation character(s) with DOMDocument. You could post-process the XML with a line-by-line regular-expression based replacing (e.g. with preg_replace):

$xml_string = preg_replace('/(?:^|\G)  /um', "\t", $xml_string);

Alternatively, there is the tidy extension with tidy_repair_string which can pretty print XML data as well. It's possible to specify indentation levels with it, however tidy will never output tabs.

tidy_repair_string($xml_string, ['input-xml'=> 1, 'indent' => 1, 'wrap' => 0]);

With a SimpleXml object, you can simply

$domxml = new DOMDocument('1.0');$domxml->preserveWhiteSpace = false;$domxml->formatOutput = true;/* @var $xml SimpleXMLElement */$domxml->loadXML($xml->asXML());$domxml->save($newfile);

$xml is your simplexml object

So then you simpleXml can be saved as a new file specified by $newfile

<?php$xml = $argv[1];$dom = new DOMDocument();// Initial block (must before load xml string)$dom->preserveWhiteSpace = false;$dom->formatOutput = true;// End initial block$dom->loadXML($xml);$out = $dom->saveXML();print_R($out);