Предопределенные константы
Перечисленные ниже константы определены данным расширением и могут быть доступны только в том случае, если PHP был собран с поддержкой этого расширения или же в том случае, если данное расширение подгружается во время выполнения.
- LIBXML_COMPACT (integer)
-
Activate small nodes allocation optimization. This may speed up your
application without needing to change the code.
Замечание: Only available in Libxml >= 2.6.21
- LIBXML_DTDATTR (integer)
- Default DTD attributes
- LIBXML_DTDLOAD (integer)
- Load the external subset
- LIBXML_DTDVALID (integer)
- Validate with the DTD
- LIBXML_NOBLANKS (integer)
- Remove blank nodes
- LIBXML_NOCDATA (integer)
- Merge CDATA as text nodes
- LIBXML_NOEMPTYTAG (integer)
-
Expand empty tags (e.g. <br/> to
<br></br>)
Замечание: This option is currently just available in the DOMDocument::save and DOMDocument::saveXML functions.
- LIBXML_NOENT (integer)
- Substitute entities
- LIBXML_NOERROR (integer)
- Suppress error reports
- LIBXML_NONET (integer)
- Disable network access when loading documents
- LIBXML_NOWARNING (integer)
- Suppress warning reports
- LIBXML_NOXMLDECL (integer)
-
Drop the XML declaration when saving a document
Замечание: Only available in Libxml >= 2.6.21
- LIBXML_NSCLEAN (integer)
- Remove redundant namespaces declarations
- LIBXML_XINCLUDE (integer)
- Implement XInclude substitution
- LIBXML_ERR_ERROR (integer)
- A recoverable error
- LIBXML_ERR_FATAL (integer)
- A fatal error
- LIBXML_ERR_NONE (integer)
- No errors
- LIBXML_ERR_WARNING (integer)
- A simple warning
- LIBXML_VERSION (integer)
- libxml version like 20605 or 20617
- LIBXML_DOTTED_VERSION (string)
- libxml version like 2.6.5 or 2.6.17
Коментарии
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/>
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!
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);
?>
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.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.