XMLReader::open()

(PHP 5 >= 5.1.0, PHP 7)

Set the URI containing the XML to parse

说明

publicXMLReader::open(string $URI[,string $encoding[,int $options= 0]]): bool

Set the URI containing the XML document to be parsed.

参数

$URI

URI pointing to the document.

$encoding

The document encoding or NULL.

$options

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

此方法可以被静态调用,但会抛出一个E_STRICT错误。

更新日志

参见

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

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');
?>

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 ...

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).

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.

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.