When inserting XML DOM Elements inside existing XML DOM Elements that I loaded from an XML file using the following code, none of my new elements were formatted correctly, they just showed up on one line:
<?php
$dom = DOMDocument::load('file.xml');
$dom->formatOutput = true;
//$dom->add some new elements with child nodes somewhere inside the loaded XML using insertBefore();
$dom->saveXML();
//output: everything looks normal but the new nodes are all on one line.
?>
I found I could pass LIBXML_NOBLANKS to the load method and it would reformat the whole document, including my added stuff:
<?php
$dom = DOMDocument::load('file.xml', LIBXML_NOBLANKS);
$dom->formatOutput = true;
//$dom->add some new elements with child nodes somewhere inside the loaded XML using insertBefore();
$dom->saveXML();
//output: everything looks newly formatted, including new nodes
?>
Hope this helps, took me hours of trial and error to figure this out!
Predefined Constants
The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
-
LIBXML_BIGLINES(int) -
Allows line numbers greater than 65535 to be reported correctly.
Note:
Only available as of PHP 7.0.0 with Libxml >= 2.9.0
-
LIBXML_COMPACT(int) -
Activate small nodes allocation optimization. This may speed up your
application without needing to change the code.
Note:
Only available in Libxml >= 2.6.21
-
LIBXML_DTDATTR(int) - Default DTD attributes
-
LIBXML_DTDLOAD(int) - Load the external subset
-
LIBXML_DTDVALID(int) -
Validate with the DTD
Caution
Enabling validating the DTD may facilitate XML External Entity (XXE) attacks.
-
LIBXML_HTML_NOIMPLIED(int) -
Sets HTML_PARSE_NOIMPLIED flag, which turns off the
automatic adding of implied html/body... elements.
Note:
Only available in Libxml >= 2.7.7 (as of PHP >= 5.4.0)
-
LIBXML_HTML_NODEFDTD(int) -
Sets HTML_PARSE_NODEFDTD flag, which prevents a default doctype
being added when one is not found.
Note:
Only available in Libxml >= 2.7.8 (as of PHP >= 5.4.0)
-
LIBXML_NOBLANKS(int) - Remove blank nodes
-
LIBXML_NOCDATA(int) - Merge CDATA as text nodes
-
LIBXML_NOEMPTYTAG(int) -
Expand empty tags (e.g.
<br/>to<br></br>)Note:
This option is currently just available in the DOMDocument::save and DOMDocument::saveXML functions.
-
LIBXML_NOENT(int) -
Substitute entities
Caution
Enabling entity substitution may facilitate XML External Entity (XXE) attacks.
-
LIBXML_NOERROR(int) - Suppress error reports
-
LIBXML_NONET(int) - Disable network access when loading documents
-
LIBXML_NOWARNING(int) - Suppress warning reports
-
LIBXML_NOXMLDECL(int) -
Drop the XML declaration when saving a document
Note:
Only available in Libxml >= 2.6.21
-
LIBXML_NSCLEAN(int) - Remove redundant namespace declarations
-
LIBXML_PARSEHUGE(int) -
Sets XML_PARSE_HUGE flag, which relaxes any hardcoded limit from the parser. This affects
limits like maximum depth of a document or the entity recursion, as well as limits of the
size of text nodes.
Note:
Only available in Libxml >= 2.7.0 (as of PHP >= 5.3.2 and PHP >= 5.2.12)
-
LIBXML_PEDANTIC(int) -
Sets XML_PARSE_PEDANTIC flag, which enables pedantic error reporting.
Note:
Available as of PHP >= 5.4.0
-
LIBXML_XINCLUDE(int) - Implement XInclude substitution
-
LIBXML_ERR_ERROR(int) - A recoverable error
-
LIBXML_ERR_FATAL(int) - A fatal error
-
LIBXML_ERR_NONE(int) - No errors
-
LIBXML_ERR_WARNING(int) - A simple warning
-
LIBXML_VERSION(int) - libxml version like 20605 or 20617
-
LIBXML_DOTTED_VERSION(string) - libxml version like 2.6.5 or 2.6.17
-
LIBXML_SCHEMA_CREATE(int) -
Create default/fixed value nodes during XSD schema validation
Note:
Only available in Libxml >= 2.6.14 (as of PHP >= 5.5.2)
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User Contributed Notes 5 notes
@oneseventeen ¶
13 years ago
siraic at gmail dot com ¶
3 years ago
The name of the constant LIBXML_NOENT is very misleading. Adding this flag actually causes the parser to load and insert the external entities. Omitting it leaves the tags untouched, which is probably what you want.
vetalstar at mail dot ru ¶
7 years ago
LIBXML_DOTTED_VERSION option doesn't work.
libxml version: 2.9.4
<?php
echo LIBXML_DOTTED_VERSION;
$xml = new SimpleXMLElement('<fasa_request id="1234567"/>', LIBXML_NOXMLDECL);
?>
Ismael Miguel ¶
1 year ago
If you want to save without the XML declaration, and LIBXML_NOXMLDECL doesn't work for you, you can just do this:
<?php
$doc = new \DOMDocument('1.0', 'UTF-8');
$doc->loadXML($xml, LIBXML_*);
echo $doc->saveXML($doc->firstElementChild);
?>
This will output the XML without the XML declaration and without using the flag.
You also don't need to do fiddly replacements and pray that it works.
zachatwork at gmail dot com ¶
14 years ago
Note: The LIBXML_NOXMLDECL constant is defined in this library but is not supported by DOMDocument (yet).
See also: http://bugs.php.net/bug.php?id=47137
<?php
print "PHP_VERSION: ".PHP_VERSION."\n";
print "LIBXML_VERSION: ".LIBXML_VERSION."\n";
print "LIBXML_NOXMLDECL: ".LIBXML_NOXMLDECL."\n";
$dom = new DomDocument();
$dom->loadXML("<foo />");
# This should work but doesn't.
print "DOMDocument doesn't honor LIBXML_NOXMLDECL:\n";
print $dom->saveXML(null,LIBXML_NOXMLDECL);
# This works, and will still work after the above is fixed.
print "Forwards compatible workaround:\n";
$lines = explode("\n", $dom->saveXML(null, LIBXML_NOXMLDECL), 2);
if(!preg_match('/^\<\?xml/', $lines[0]))
print $lines[0];
print $lines[1];
?>
PHP_VERSION: 5.3.1-0.dotdeb.1
LIBXML_VERSION: 20632
LIBXML_NOXMLDECL: 2
DOMDocument doesn't honor LIBXML_NOXMLDECL:
<?xml version="1.0"?>
<foo/>
Forwards compatible workaround:
<foo/>
