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 $encoding = null, int $flags = 0): XMLReader

public XMLReader::open(string $uri, ?string $encoding = null, int $flags = 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.
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

Passing an invalid encoding will throw a ValueError.
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
8.4.0	Passing an invalid `encoding` will now throw a ValueError.
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

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用户贡献的备注 5 notes

down

den at nurfuerspam dot de ¶

7 years ago

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');

?>

down

dave at sophoservices dot com ¶

8 years ago

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 ...

down

alvaro at demogracia dot com ¶

10 years ago

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).

down

crungmungus at gmail dot com ¶

16 years ago

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.

down

-2

mood(_a_)twolate.com ¶

8 years ago

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.