Can $node->node_value() return a null value?

[mr_burns]

Hi,

I am using the following function to access a nodes value from an XML
file. It works fine until it discovers a empty tag. I would like to
have the option of leaving some tags empty for my script.


..
..
..
function foutput_contact ($node_name) {
$xml_document = domxml_open_fil e('xml/contacts.xml');
if ($xml_document) {
$nodes= $xml_document->get_elements_b y_tagname($node _name);
$nodeCount = count($nodes);
$node = $nodes[0];
if ($node) {
$node = $node->first_child( );
return $node->node_value() ;
}
}
}


The error is returned at the line 'return $node->node_value() ' but
only when I use an empty node. Can this script be modified to allow
empty nodes? Cheers

Burnsy

[Janwillem Borleffs]

Re: Can $node->node_value( ) return a null value?

mr_burns wrote:[color=blue]
> The error is returned at the line 'return $node->node_value() ' but
> only when I use an empty node. Can this script be modified to allow
> empty nodes? Cheers
>[/color]

Which error is returned and what is the structure of contacts.xml?


JW

[mr_burns]

Re: Can $node->node_value( ) return a null value?

"Janwillem Borleffs" <jw@jwscripts.c om> wrote in message news:<413f04ce$ 0$46376$cd19a36 3@news.euronet. nl>...[color=blue]
> mr_burns wrote:[color=green]
> > The error is returned at the line 'return $node->node_value() ' but
> > only when I use an empty node. Can this script be modified to allow
> > empty nodes? Cheers
> >[/color]
>
> Which error is returned?[/color]


Fatal error: Call to a member function on a non-object in
/home/martyn69/public_html/oarsome/includes/functions.php on line 38

[color=blue]
> and what is the structure of contacts.xml?[/color]


<?xml version="1.0" encoding="iso-8859-1"?>
<contacts>
<address1>123 </address1>
<address2>Fak e Street</address2>
<address3>Sprin gfield</address3>
<phone>0141 952 3161</phone>
<mobile></mobile>
<email>bissatch @yahoo.co.uk</email>
</contacts>


The error only seems to occur when I leave a node empty (see mobile
node above).

Cheers

Martyn

[Janwillem Borleffs]

Re: Can $node-&gt;node_value( ) return a null value?

mr_burns wrote:[color=blue]
> The error only seems to occur when I leave a node empty (see mobile
> node above).
>[/color]

This should do it:

function foutput_contact ($node_name) {
$xml_document = domxml_open_fil e('contacts.xml ');
if ($xml_document) {
$nodes= $xml_document->get_elements_b y_tagname($node _name);
$nodeCount = count($nodes);
$node = $nodes[0];

if ($node && $node->has_child_node s()) {
$node = $node->first_child( );
return $node->node_value() ;
} else {
return "";
}
}
}

Or even simpler:

function foutput_contact ($node_name) {
$xml_document = domxml_open_fil e('contacts.xml ');
if ($xml_document) {
$nodes= $xml_document->get_elements_b y_tagname($node _name);
$nodeCount = count($nodes);
$node = $nodes[0];
return $node ? $node->get_content( ) : "";
}
}


JW