XMLReader::open

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

XMLReader::open — Set the URI containing the XML to parse

说明

public static XMLReader::open ( string $uri , string|null $encoding = null , int $flags = 0 ) : bool|XMLReader

Set the URI containing the XML document to be parsed.

参数

uri: URI pointing to the document.
encoding: The document encoding or null.
flags: A bitmask of the LIBXML_* constants.

返回值

成功时返回 true，或者在失败时返回 false。 If called statically, returns an XMLReader 或者在失败时返回 false.

错误／异常

This method may be called statically, but prior to PHP 8.0.0, will issue an E_DEPRECATED error in this case.

更新日志

版本	说明
8.0.0	XMLReader::open() is now declared as static method, but can still be called on an XMLReader instance.

参见

XMLReader::xml() - Set the data containing the XML to parse
XMLReader::close() - Close the XMLReader input

User Contributed Notes

den at nurfuerspam dot de 29-Apr-2017 10:08


If you like to read the XML from HTTP whit a POST request, you can use libxml_set_streams_context.

Example:



<?php



$param = array('http' => array(

    'method' => 'POST',

    'header' => "Content-type: application/x-www-form-urlencoded\r\n",

    'content' => http_build_query(array(

        'post_param1' => 'value1',

        'post_param2' => 'value2',

    )),

));

libxml_set_streams_context(stream_context_create($param));

$reader = XMLReader::open('https://example.com/get.php?get_param=value3');



?>

dave at sophoservices dot com 02-Dec-2016 07:43


When using the XmlReader to read local XML files, remember it the open function requests a URI. Add 'file://' to the front of the FULL path to the XML. Otherwise you may get:



PHP Warning:  XMLReader::open(): Unable to open source data in ...

mood(_a_)twolate.com 14-Oct-2016 11:03


For some reasons, the open() method keep throwing me this error :



PHP Warning:  XMLReader::open(): Unable to open source data in /var/www/nota/ethamap/fat_xml.php



It doesn't make sense as the xml file target hosted on my server is perfectly reachable. Adding this line before invoking open() fixed it : 



libxml_disable_entity_loader(false); 



Please view https://bugs.php.net/bug.php?id=62577

It is somehow related.

alvaro at demogracia dot com 14-Nov-2014 12:35


XML can optionally declare its own encoding:



    <?xml version="1.0" encoding="UTF-8"?>



You can use the $encoding parameter to provide this information (if missing) or override it (if wrong).



Output is always UTF-8 (that's how libxml works).

crungmungus at gmail dot com 15-Sep-2008 05:11


Windows users remember to enable php_openssl.dll in your php.ini if you want to be able to use this function (and others) with a HTTPS URL.