PHP __construct() Function

Example

Create a SimpleXMLElement object from a string:

<?php
$note=<<<XML
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Do not forget me this weekend!</body>
</note>
XML;

$xml=new SimpleXMLElement($note);
echo $xml->asXML();
?>

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Definition and Usage

The __construct() function creates a new SimpleXMLElement object.

Syntax

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"?>
<note>
    <to>Tove</to>
    <from>Jani</from>
    <heading>Reminder</heading>
    <body>Don't forget me this weekend!</body>
</note>

Example

Create a SimpleXMLElement object from a URL:

<?php
$xml=new SimpleXMLElement("note.xml", 0, TRUE);
echo $xml->asXML();
?>

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❮ PHP SimpleXML Reference