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PHP __construct() Function

❮ PHP SimpleXML Reference


Create a SimpleXMLElement object from a string:

<body>Do not forget me this weekend!</body>

$xml=new SimpleXMLElement($note);
echo $xml->asXML();
Run Example »

Definition and Usage

The __construct() function creates a new SimpleXMLElement object.


SimpleXMLElement::__construct(data, options, data_is_url, ns, is_prefix)

Parameter Values

Parameter Description
data Required. Specifies A well-formed XML string or the path or URL to an XML document if data_is_url is TRUE
options Optional. Specifies additional Libxml parameters. Is set by specifying the option and 1 or 0 (TRUE or FALSE, e.g. LIBXML_NOBLANKS(1))

Possible values:

  • LIBXML_COMPACT - Activate nodes allocation optimization (may speed up application)
  • LIBXML_DTDATTR - Set default DTD attributes
  • LIBXML_DTDLOAD - Load external subset
  • LIBXML_DTDVALID - Validate with the DTD
  • LIBXML_NOBLANKS - Remove blank nodes
  • LIBXML_NOCDATA - Merge CDATA as text nodes
  • LIBXML_NOEMPTYTAG - Expand empty tags (e.g. <br/> to <br></br>), only available in the DOMDocument->save() and DOMDocument->saveXML() functions
  • LIBXML_NOENT - Substitute entities
  • LIBXML_NOERROR - Do not show error reports
  • LIBXML_NONET - Disable network access while loading documents
  • LIBXML_NOWARNING - Do not show warning reports
  • LIBXML_NOXMLDECL - Drop the XML declaration when saving a document
  • LIBXML_NSCLEAN - Remove redundant namespace declarations
  • LIBXML_PARSEHUGE - Sets XML_PARSE_HUGE flag, which relaxes any hardcoded limit from the parser. This affects limits like maximum depth of a document and limits of the size of text nodes
  • LIBXML_XINCLUDE - Implement XInclude substitution
  • LIBXML_ERR_ERROR - Get recoverable errors
  • LIBXML_ERR_FATAL - Get fatal errors
  • LIBXML_ERR_NONE - Get no errors
  • LIBXML_ERR_WARNING - Get simple warnings
  • LIBXML_VERSION - Get libxml version (e.g. 20605 or 20617)
  • LIBXML_DOTTED_VERSION - Get dotted libxml version (e.g. 2.6.5 or 2.6.17)
data_is_url Optional. TRUE specifies that data is a path/URL to an XML document instead of string data. Default is FALSE
ns Optional. Specifies a namespace prefix or URI
is_prefix Optional. Specifies a Boolean value. TRUE if ns is a prefix. FALSE if ns is a URI. Default is FALSE

Technical Details

Return Value: Returns a SimpleXMLElement object that represents data
PHP Version: 5.0+
PHP Changelog: PHP 5.2.0: Added the optional ns and is_prefix parameters.
PHP 5.1.2: Added the optional options and data_is_url parameters.

More Examples

Assume we have the following XML file, "note.xml":

<?xml version="1.0" encoding="UTF-8"?>
    <body>Don't forget me this weekend!</body>


Create a SimpleXMLElement object from a URL:

$xml=new SimpleXMLElement("note.xml", 0, TRUE);
echo $xml->asXML();
Run Example »

❮ PHP SimpleXML Reference