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Indentation with DOMDocument in PHP#1
I(m using DOMDocument to generate a new XML file and I would like for the output of the file to be indented nicely so that it(s easy to follow for a human reader.

For example, when DOMDocument outputs this data:

<?xml version="1.0"?>
<this attr="that"><foo>lkjalksjdlakjdlkasd</foo><foo>lkjlkasjlkajklajslk</foo></this>


I want the XML file to be:

<?xml version="1.0"?>
<this attr="that">
<foo>lkjalksjdlakjdlkasd</foo>
<foo>lkjlkasjlkajklajslk</foo>
</this>


I(ve been searching around looking for answers, and everything that I(ve found seems to say to try to control the white space this way:

$foo = new DOMDocument();
$foo->preserveWhiteSpace = false;
$foo->formatOutput = true;


But this does not seem to do anything. Perhaps this only works when reading XML? Keep in mind I(m trying to write new documents.

Is there anything built-in to DOMDocument to do this? Or a function that can accomplish this easily?

posted date: 2009-04-13 19:25:00


Re: Indentation with DOMDocument in PHP#2
I had made out the solution of this problem. click to view my topic...

hope that hepls.

posted date: 2009-04-13 19:25:01


Re: Indentation with DOMDocument in PHP#3
I have tried running the code below setting formatOutput and preserveWhiteSpace in different ways, and the only member that has any effect on the output is formatOutput. Can you run the script below and see if it works?<?php echo "<pre>"; $foo = new DOMDocument(); //$foo->preserveWhiteSpace = false; $foo->formatOutput = true; $root = $foo->createElement("root"); $root->setAttribute("attr", "that"); $bar = $foo->createElement("bar", "some text in bar"); $baz = $foo->createElement("baz", "some text in baz"); $foo->appendChild($root); $root->appendChild($bar); $root->appendChild($baz); echo htmlspecialchars($foo->saveXML()); echo "</pre>";?>

posted date: 2009-04-13 19:38:00


Re: Indentation with DOMDocument in PHP#4
Your code works fine, but it doesn't work for me with the way I've set it up. I have a class xml and inside that class I create a variable $this->xml which holds an instance of DOMDocument, and it doesn't seem to work with that setup. I would also prefer to have real tabs instead of just spaces.

posted date: 2009-04-13 20:26:00


Re: Indentation with DOMDocument in PHP#5
This seems like a special case then. I created a simple class with "xml" as a member, and it still worked. There are too many factors and without your exact code (or a simplified version that still fails for you) it's going to be impossible to reproduce.

posted date: 2009-04-13 20:56:00


Re: Indentation with DOMDocument in PHP#6
Thanks for your help John. I've written a basic indentation function that will hopefully fix my problem (about to post it as an answer if you want to take a look).

posted date: 2009-04-13 21:19:00


Re: Indentation with DOMDocument in PHP#7
After some help from John and playing around with this on my own, it seems that even DOMDocument(s inherent support for formatting didn(t meet my needs. So, I decided to write my own indentation function.This is a pretty crude function that I just threw together quickly, so if anyone has any optimization tips or anything to say about it in general, I(d be glad to hear it!function indent($text){ // Create new lines where necessary $find = array((>(, (</(, "\n\n"); $replace = array(">\n", "\n</", "\n"); $text = str_replace($find, $replace, $text); $text = trim($text); // for the \n that was added after the final tag $text_array = explode("\n", $text); $open_tags = 0; foreach ($text_array AS $key => $line) { if (($key == 0) || ($key == 1)) // The first line shouldn(t affect the indentation $tabs = ((; else { for ($i = 1; $i <= $open_tags; $i++) $tabs .= "\t"; } if ($key != 0) { if ((strpos($line, (</() === false) && (strpos($line, (>() !== false)) $open_tags++; else if ($open_tags > 0) $open_tags--; } $new_array[] = $tabs . $line; unset($tabs); } $indented_text = implode("\n", $new_array); return $indented_text;}

posted date: 2009-04-13 21:27:00


Re: Indentation with DOMDocument in PHP#8
There is a nice straightforward function (based on regular expressions) here: Format XML with PHP

posted date: 2009-04-13 22:08:00


Re: Indentation with DOMDocument in PHP#9
A quick remark: There is str_repeat() for the creating the tabs. The rest of the function seems quite okay to me. You could set up a small performance comparison to the one I've found. As an alternative idea, you can use strtok() to tokenize the input iteratively (instead of replace/explode).

posted date: 2009-04-13 22:29:00


Re: Indentation with DOMDocument in PHP#10
Thanks! I actually like the function you found better than my own, as I've discovered it does the formatting badly the deeper you go. And I never knew about either str_repeat() or strtok(), so thanks for that as well!

posted date: 2009-04-20 15:16:00


Re: Indentation with DOMDocument in PHP#11
I am not sure what the question is. The code you show will give the output you are asking for. Proof: codepad.org/4UGyRspx and codepad.org/bLTOFQrp - are you asking about the indentation level, e.g. the number of spaces used?

posted date: 2012-03-04 10:20:00


Re: Indentation with DOMDocument in PHP#12
Which method do you call when printing the xml?I use this:$doc = new DOMDocument((1.0(, (utf-8();$root = $doc->createElement((root();$doc->appendChild($root);(...)$doc->formatOutput = true;$doc->saveXML($root);It works perfectly but prints out only the element, so you must print the <?xml ... ?> part manually..

posted date: 2012-04-20 02:01:00


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