Php read xml http

PHP SimpleXML Parser

SimpleXML is a PHP extension that allows us to easily manipulate and get XML data.

The SimpleXML Parser

SimpleXML is a tree-based parser.

SimpleXML provides an easy way of getting an element’s name, attributes and textual content if you know the XML document’s structure or layout.

SimpleXML turns an XML document into a data structure you can iterate through like a collection of arrays and objects.

Compared to DOM or the Expat parser, SimpleXML takes a fewer lines of code to read text data from an element.

Installation

From PHP 5, the SimpleXML functions are part of the PHP core. No installation is required to use these functions.

PHP SimpleXML — Read From String

The PHP simplexml_load_string() function is used to read XML data from a string.

Assume we have a variable that contains XML data, like this:

The example below shows how to use the simplexml_load_string() function to read XML data from a string:

Example

$xml=simplexml_load_string($myXMLData) or die(«Error: Cannot create object»);
print_r($xml);
?>

The output of the code above will be:

SimpleXMLElement Object ( [to] => Tove [from] => Jani [heading] => Reminder [body] => Don’t forget me this weekend! )

Error Handling Tip: Use the libxml functionality to retrieve all XML errors when loading the document and then iterate over the errors. The following example tries to load a broken XML string:

Example

$xml = simplexml_load_string($myXMLData);
if ($xml === false) echo «Failed loading XML: «;
foreach(libxml_get_errors() as $error) echo «
«, $error->message;
>
> else print_r($xml);
>
?>

The output of the code above will be:

Failed loading XML:
Opening and ending tag mismatch: user line 3 and wronguser
Opening and ending tag mismatch: email line 4 and wrongemail

PHP SimpleXML — Read From File

The PHP simplexml_load_file() function is used to read XML data from a file.

Assume we have an XML file called «note.xml», that looks like this:

The example below shows how to use the simplexml_load_file() function to read XML data from a file:

Example

The output of the code above will be:

SimpleXMLElement Object ( [to] => Tove [from] => Jani [heading] => Reminder [body] => Don’t forget me this weekend! )

Tip: The next chapter shows how to get/retrieve node values from an XML file with SimpleXML!

More PHP SimpleXML

For more information about the PHP SimpleXML functions, visit our PHP SimpleXML Reference.

Источник

DOMDocument::load

Unix style paths with forward slashes can cause significant performance degradation on Windows systems; be sure to call realpath() in such a case.

Parameters

The path to the XML document.

Return Values

Returns true on success or false on failure. If called statically, returns a DOMDocument or false on failure.

Errors/Exceptions

If an empty string is passed as the filename or an empty file is named, a warning will be generated. This warning is not generated by libxml and cannot be handled using libxml’s error handling functions.

Prior to PHP 8.0.0 this method could be called statically, but would issue an E_DEPRECATED error. As of PHP 8.0.0 calling this method statically throws an Error exception

Examples

Example #1 Creating a Document

See Also

• DOMDocument::loadXML() — Load XML from a string
• DOMDocument::save() — Dumps the internal XML tree back into a file
• DOMDocument::saveXML() — Dumps the internal XML tree back into a string

User Contributed Notes 14 notes

I had a problem with loading documents over HTTP. I would get errors looking like this:

Warning: DOMDocument::load(http://external/document.xml): failed to open stream: HTTP request failed! HTTP/1.1 500 Internal Server Error

The document would load fine in browsers and using wget. The problem is that DOMDocument::load() on my systems (both OS X and Linux) didn’t send any User-Agent header which for some weird reason made Microsoft-IIS/6.0 respond with the 500 error.

$opts = array(
‘http’ => array(
‘user_agent’ => ‘PHP libxml agent’ ,
)
);

$context = stream_context_create ( $opts );
libxml_set_streams_context ( $context );

In reply to BadGuy [at] BadGuy [dot] nl

When the news.php file is located on the same server, like you said in the first example then http://my.beautiful-website.com/xmlsource/news.php wouldn’t work, but you should use http://localhost/xmlsource/news.php or http://127.0.0.1/xmlsource/news.php

NOTE, will not load successfully if there is a comment at the beginning of the file before the declaration!

Note that this method uses the local file system before doing anything remote. The ‘disadvantage’ would be that if you would do the following:
$xml = new DOMDocument ;
$xml -> load ( «xmlsource/news.php» );
?>

This would not make the method read the actual output of the news.php file —presumably valid xml data—, but the file contents —obviously this would be php code. So this will return an error saying news.php is missing the xml declaration and maybe the xml start-tag

What would work is the following:

$xml = new DOMDocument ;
$xml -> load ( «http://my.beautiful-website.com/xmlsource/news.php» );
?>

This will force a http request to be used to get this file instead of just locally reading it and the file just returning code

BadGuy´s note may be confusing since what he depicts is no special property of the relevant method. PHP works always in and on a local file system which means that if you want to use resources from other systems or — what is, indeed, BadGuy´s problem — need resources that have been dealt with by other programs or processes, you have to state and manage that explicitly in your code. PHP is just a quite normal program in that.

BadGuy´s solution is using the «http wrapper» to get output from another process (see «wrappers» in the PHP manual). Doing this, the appropriate syntax for http calls has to be respected.

$doc = new DOMDocument ();
$doc -> load ( ‘book.xml’ );
echo $doc -> saveXML ();
?>

you must enter the absolute path for book.xml due for get a false result in load function.

load() will handle non-ASCII characters depending on the details of the XML declaration, but in a somewhat surprising way. One would assume that the declarations » and » are treated in the same way because UTF-8 is the default encoding anyway. But not so.

* If there is an XML declaration defining the encoding *explicitly*, the non-ASCII characters remain unchanged.
* If the XML declaration does not define the encoding explicitly, or if the XML declaration is missing, non-ASCII characters are converted into numeric entities.

The same happens if there is no XML declaration at all. On the other hand, the document

This behaviour applies to loadXML() as well.

i’ve found the partial solution for xml:id warning,is explained at this address: https://fosswiki.liip.ch/display/BLOG/GetElementById+Pitfalls

there explains that:
The ID does have to be a valid NCName, which for example means, that the first letter can’t be a number.

and in my xml:id i had a number. 😀

XHTML and entities: The solution proposed below by zachatwork at gmail dot com didn’t work for me. I checked on a number of servers (both LAMPP and WAMPP) — on each of them, calling loadXML() with the LIBXML_DTDLOAD option triggered an external request for the DTD. And that’s bad news.

If allow_url_fopen is turned off, the request for the DTD fails with a warning. If it is turned on, the request fails because these w3c URLs return a 503 Service Unavailable.

HTML entities still generate a warning in either case.

The best solution, as far as I can tell, is simply to ignore the warnings and suppress them using ‘@’. I can’t recommend parsing XHTML with loadHTML() instead of loadXML() — yes, you get rid of the entity problem, but loadHTML() changes the source while parsing it (tries to ‘fix’ it even though there is nothing to fix).

Suppose you wanted to dynamically load an array from an .XSD file. This method is your guy. just remember to use the actual xs: portion in xpaths and such.

All the other «load» methods will error out.

$attributes = array();
$xsdstring = «/htdocs/api/xsd/common.xsd» ;
$XSDDOC = new DOMDocument ();
$XSDDOC -> preserveWhiteSpace = false ;
if ( $XSDDOC -> load ( $xsdstring ))
<
$xsdpath = new DOMXPath ( $XSDDOC );
$attributeNodes =
$xsdpath ->
query ( ‘//xs:simpleType[@name=»attributeType»]’ )
-> item ( 0 );
foreach ( $attributeNodes -> childNodes as $attr )
<
$attributes [ $attr -> getAttribute ( ‘value’ ) ] = $attr -> getAttribute ( ‘name’ );
>
unset( $xsdpath );
>
print_r ( $attributes );
?>

If you are loading xml with the intention of validating it against an internal dtd and you have experienced issues with the validation it could be related to missing LIBXML constants.

I found this post by «aidan at php dot net» in root level dom docs and thought it might be more useful here:
As of PHP 5.1, libxml options may be set using constants rather than the use of proprietary DomDocument properties.

DomDocument->resolveExternals is equivilant to setting
LIBXML_DTDLOAD
LIBXML_DTDATTR

DomDocument->validateOnParse is equivilant to setting
LIBXML_DTDLOAD
LIBXML_DTDVALID

PHP 5.1 users are encouraged to use the new constants.

Example:
$dom = new DOMDocument ;
// Resolve externals
$dom -> load ( $file , LIBXML_DTDLOAD | LIBXML_DTDATTR );
// OR
// Validate against DTD
$dom -> load ( $file , LIBXML_DTDLOAD | LIBXML_DTDVALID );
$dom -> validate ();
?>

adding an id for a child, when i use abstract mode i get the following warning:

[quote]Warning: DOMDocument::load() [domdocument.load]: xml:id : attribute value xx is not an NCName in /fake/path/to/xmlfile[/quote]

You can easily avoid the warning about   references by using the LIBXML_DTDLOAD option.

// This one works perfectly.
$dom = new DOMDocument ();
$dom -> loadXML ( $html , LIBXML_DTDLOAD );
print $dom -> saveXML ();

// This one produces a warning.
$dom = new DOMDocument ();
$dom -> loadXML ( $html );
print $dom -> saveXML ();

Note that libxml will detect that your DTD is locally available via /etc/xml/catalog. So there is no worry about this causing your DOM loads to make external network requests.

• DOMDocument
  • _​_​construct
  • createAttribute
  • createAttributeNS
  • createCDATASection
  • createComment
  • createDocumentFragment
  • createElement
  • createElementNS
  • createEntityReference
  • createProcessingInstruction
  • createTextNode
  • getElementById
  • getElementsByTagName
  • getElementsByTagNameNS
  • importNode
  • load
  • loadHTML
  • loadHTMLFile
  • loadXML
  • normalizeDocument
  • registerNodeClass
  • relaxNGValidate
  • relaxNGValidateSource
  • save
  • saveHTML
  • saveHTMLFile
  • saveXML
  • schemaValidate
  • schemaValidateSource
  • validate
  • xinclude

  Источник

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