xml_error_string(errorcode)

<?php
//invalid xml file
$xmlfile = 'test.xml';

$xmlparser = xml_parser_create();

// open a file and read data
$fp = fopen($xmlfile, 'r');
while ($xmldata = fread($fp, 4096))
{
// parse the data chunk
if (!xml_parse($xmlparser,$xmldata,feof($fp)))
{
die( print "ERROR: "
. xml_error_string(xml_get_error_code($xmlparser))
. "<br />"
. "Line: "
. xml_get_current_line_number($xmlparser)
. "<br />"
. "Column: "
. xml_get_current_column_number($xmlparser)
. "<br />");
}
}

xml_parser_free($xmlparser);
?>

ERROR: Mismatched tag
Line: 5
Column: 41