Question

I am trying to pull text from a single element in an xml file, i was able to pull the entire file but i really only need a couple of lines from the file…

On this page i was able to pull the entire xml file ( http://smyrnainlet.com/testing.php )

But when i try to just single out one line from that file.
http://smyrnainlet.com/current_data.php

This is the error i am receiving:

Fatal error: Call to a member function getbyElementID() on a non-object in /home/content/74/8620474/html/current_data.php on line 9

If anyone could help me that would be amazing, i have been struggling with this for hours.

This is my code:

<?php

function startElemHandler($parser, $name, $attribs) 
{
    if (strcasecmp($name, "current_observation") ==0 ) {
        echo "<div id='waves'>\n";
    }
    if (strcasecmp($name, "wave_height_ft") ==0) {
            $waveHeight->getbyElementID("wave_height_ft");

            echo $waveHeight->asXML();
    }

}

function endElemHandler($parser, $name)
{ 
    if (strcasecmp($name, "current_observation") ==0 ) {
        echo "</div>";
    }

}

$parser = xml_parser_create();
xml_set_element_handler($parser, startElemHandler, endElemHandler);
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);

$strXML = implode("",file("http://www.weather.gov/xml/current_obs/41009.xml"));

xml_parse($parser, $strXML);

xml_parser_free($parser);


?>

Answer 1

You have a few fundamental flaws with your code but you are essentially asking how to parse an XML file. I suggest using PHP’s DOMDocument with DOMXPath to extract the data you need. Here is some example code:

$xml = file_get_contents('weather.xml');
$dom = new DOMDocument();
@$dom->loadHTML($xml);
$domx = new DOMXPath($dom);
$entries = $domx->evaluate("//wave_height_ft");
$arr = array();
foreach ($entries as $entry) {
    $arr[] = '<' . $entry->tagName . '>' . $entry->nodeValue .  '</' . $entry->tagName . '>';
}
print_r($arr);