PHP cURL XML Response with single XML Tag

Question

I am using SimpleXML to load a response from an API call. However, if the server returns an error, it only returns a single XML tag with the error message:

<err>ERROR MESSAGE HERE</err>

I'm currently using this code to parse the API response:

$parsedresponse = simplexml_load_string($response);

The $parsedresponse variable contains only the error message. However, I need a way to check if the <err> tag is present so I know if there was an error. I can't seem to figure out how to do this...

Thank you!

It might be easier to check the response for <err> before loading it into simple XML. — datasage
– datasage, Commented Jan 23, 2013 at 19:00
OK - that's what I was thinking to. But I still can't quite figure out how to determine if it's in the raw response. I've tried if (!empty($response->err)) etc but that doesn't seem to do anything.... — Jason
– Jason, Commented Jan 23, 2013 at 19:05

Shiplu Mokaddim · Accepted Answer · 2013-01-23 19:15:20Z

1

If err tag is the root tag use the following condition to trace the error.

if ($parsedresponse->getName()=='err'){
    // got it
}

If its the first child use

if (isset($parsedresponse->err)){
    // got it
}

negate the condition as necessary.

edited Jan 23, 2013 at 19:15

answered Jan 23, 2013 at 19:07

Shiplu Mokaddim

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2 Comments

Jason Over a year ago

Thanks. I just tried this code but PHP fails with this: Fatal error: Can't use method return value in write context

Shiplu Mokaddim Over a year ago

@Jason Oops. It'd be == instead of =. Writing from iPad, so missed it. See the update

Davit · Accepted Answer · 2013-01-23 19:08:32Z

0

<?php

$xml = <<<EOF
<?xml version="1.0" encoding="UTF-8"?>
<err>ERROR MESSAGE HERE</err>
EOF;

$sxml = simplexml_load_string($xml);

if ($sxml->getName() != "err") print('not set');
else print('set');

?>

answered Jan 23, 2013 at 19:08

Davit

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