php xpath problems - php

Question

I'm doing a cURL POST and get the error response back, parse it into an array but having issues with xpath now.
// XML
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<errors xmlns="http://host/project">
<error code="30" description="[] is not a valid email address."/>
<error code="12" description="id[] does not exist."/>
<error code="3" description="account[] does not exist."/>
<error code="400" description="phone[] does not exist."/>
</errors>
// Function / Class
class parseXML
{
protected $xml;
public function __construct($xml) {
if(is_file($xml)) {
$this->xml = simplexml_load_file($xml);
} else {
$this->xml = simplexml_load_string($xml);
}
}
public function getErrorMessage() {
$in_arr = false;
$el = $this->xml->xpath("//#errors");
$returned_errors = count($el);
if($returned_errors > 0) {
foreach($el as $element) {
if(is_object($element) || is_array($element)) {
foreach($element as $item) {
$in_arr[] = $item;
}
}
}
} else {
return $returned_errors;
}
return $in_arr;
}
}
// Calling function
// $errorMessage is holding the XML value in an array index
// something like: $arr[3] = $xml;
$errMsg = new parseXML($arr[3]);
$errMsgArr = $errMsg->getErrorMessage();
What I would like is all the error code and description attribute values
EDIT:
OK this is print_r($this->xml,true);
SimpleXMLElement Object
(
[error] => Array
(
[0] => SimpleXMLElement Object
(
[#attributes] => Array
(
[code] => 30
[description] => [] is not a valid email address.
)
)
[1] => SimpleXMLElement Object
(
[#attributes] => Array
(
[code] => 12
[description] => Id[12345] does not exist.
)
)
[2] => SimpleXMLElement Object
(
[#attributes] => Array
(
[code] => 3
[description] => account[] does not exist.
)
)
[3] => SimpleXMLElement Object
(
[#attributes] => Array
(
[code] => 400
[description] => phone[] does not exist.
)
)
)
)
for the life of me I can't figure out why I can get the code and description, any thoughts?
EDIT #2
Okay so I guess I will break it down.
I'm using cURL to POST a request to one of our servers, I parse out the HTTP response headers and xml (if xml is returned). each line in the header/xml I explode into an array. so if there is an error I see an extra index to the array. I then do something like this.
$if_err_from_header = $http_return_response[10];
// I know that index 10 is where if any the error message in xml is (the one posted above).
after that I do this:
$errMsg = new parseXML($if_err_from_header);
$errMsgArr = $errMsg->getErrorMessage();
still I can not get the code and description from the attributes in error, what am I missing?
EDIT #3
Okay why does this work?
$in_arr = false;
// This returns all the code attributes
$el = $this->xml->xpath("//#code");
# if $el is false, nothing returned from xpath(), set to an empty array
$el = $el == false ? array() : $el;
foreach($el as $element) {
$in_arr[] = array("code" => $element["code"], "description" => $element["description"]);
}
return $in_arr;
EDIT #4:
Okay this gets that values I want but it's kinda a hack, would like to select specific elements but...
$el = $this->xml->xpath("//*");

Answer 1

Make sure you take the namespace into account:
$this->xml->registerXPathNamespace('n', 'http://host/project');
$el = $this->xml->xpath("/n:errors/n:error");
$returned_errors = count($el);
And example of accessing values for lower down..
foreach($el as $element) {
print "code: " . $element["code"] . "\n";
}

Answer 2

# in XPath is the attribute selector. You're trying to select the root element so it should be:
$el = $this->xml->xpath("/errors");
If you want to select all error elements, use
$el = $this->xml->xpath("/errors/error");
or
$el = $this->xml->xpath("//error");