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[2010-08-31 11:24 UTC] ivan dot enderlin at hoa-project dot net
Description:
------------
SimpleXML misses a XPath function which is processing-instruction(). This last one enables to reach/select PIs along the XML document.
Test script:
---------------
<?php
$xml = '<?xml version="1.0" encoding="utf-8"?>' . "\n\n" .
'<foo>' . "\n" .
' <bar>Gordon</bar>' . "\n" .
' <bar><![CDATA[Gordon]]></bar>' . "\n" .
' <bar><?baz href="ftw" ?></bar>' . "\n" .
'</foo>';
$sxe = simplexml_load_string($xml);
var_dump(
$sxe->xpath('//bar')
);
var_dump(
$sxe->xpath('//processing-instruction(\'baz\')')
);
Expected result:
----------------
//bar
array(3) {
[0]=>
object(SimpleXMLElement)#2 (1) {
[0]=>
string(6) "Gordon"
}
[1]=>
object(SimpleXMLElement)#3 (0) {
}
[2]=>
object(SimpleXMLElement)#4 (1) {
["baz"]=>
object(SimpleXMLElement)#5 (0) {
}
}
}
//processing-instruction('baz')
array(1) {
[2]=>
object(SimpleXMLElement)#6 (1) {
…
}
}
Actual result:
--------------
//bar
array(3) {
[0]=>
object(SimpleXMLElement)#2 (1) {
[0]=>
string(6) "Gordon"
}
[1]=>
object(SimpleXMLElement)#3 (0) {
}
[2]=>
object(SimpleXMLElement)#4 (1) {
["baz"]=>
object(SimpleXMLElement)#5 (0) {
}
}
}
//processing-instruction('baz')
array(0) {
}
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Last updated: Mon Jan 25 18:01:23 2021 UTC |
I forget to notice that DOMXPath support this function. If we take the first code example: $doc = dom_import_simplexml($sxe)->ownerDocument; $xpath = new DOMXPath($doc); $e = $xpath->query('//processing-instruction(\'baz\')'); var_dump($e, $e->length, $e->item(0)->data); It will output: object(DOMNodeList)#8 (0) { } int(1) string(11) "href="ftw" " That's what we expected! But I think that SimpleXML does not simply support PI. Maybe you noticed that when outputing //bar, in the 2 offset, we have “baz”. Well, try to use it: $handle = $sxe->xpath('//bar'); var_dump( dom_import_simplexml($handle[2]) ->childNodes ->item(0) ->data ); It will output: string(11) "href="ftw" " We must use the DOM API to reach PI data. Conclusion: • processing-instruction() works with DOMXpath, not with SimpleXML. • PIs appear in the DOM and the SimpleXML tree. • PIs are usable only with the DOM API.