PHP: Loading multiple XML feeds with simple_xml_load_file

Question

I'm retrieving multiple weather forecasts through Yahoo's weather API -

$stockholm = simplexml_load_file("http://weather.yahooapis.com/forecastrss?w=906057&u=c");
$stockholm->registerXpathNamespace('yweather', 'http://xml.weather.yahoo.com/ns/rss/1.0'); 
$children = $stockholm->xpath('//channel/item/yweather:condition'); 
echo '<li><img class="c' . $children[0]['code'] . '" src="img/spacer.gif" alt=""><h2>' . $children[0]['temp'] . '&deg;</h2><p><strong>Stockholm</strong></p></li>';

$alicante = simplexml_load_file("http://weather.yahooapis.com/forecastrss?w=752101&u=c");
$alicante->registerXpathNamespace('yweather', 'http://xml.weather.yahoo.com/ns/rss/1.0'); 
$children = $alicante->xpath('//channel/item/yweather:condition'); 
echo '<li><img class="c' . $children[0]['code'] . '" src="img/spacer.gif" alt=""><h2>' . $children[0]['temp'] . '&deg;</h2><p><strong>Alicante</strong></p></li>';

$marbella = simplexml_load_file("http://weather.yahooapis.com/forecastrss?w=766537&u=c");
$marbella->registerXpathNamespace('yweather', 'http://xml.weather.yahoo.com/ns/rss/1.0'); 
$children = $marbella->xpath('//channel/item/yweather:condition'); 
echo '<li><img class="c' . $children[0]['code'] . '" src="img/spacer.gif" alt=""><h2>' . $children[0]['temp'] . '&deg;</h2><p><strong>Marbella</strong></p></li>';

$torrevieja = simplexml_load_file("http://weather.yahooapis.com/forecastrss?w=775868&u=c");
$torrevieja->registerXpathNamespace('yweather', 'http://xml.weather.yahoo.com/ns/rss/1.0'); 
$children = $torrevieja->xpath('//channel/item/yweather:condition'); 
echo '<li><img class="c' . $children[0]['code'] . '" src="img/spacer.gif" alt=""><h2>' . $children[0]['temp'] . '&deg;</h2><p><strong>Torrèvieja</strong></p></li>';

Is there a more effective way to load these feeds, possibly together? The response time is fairly minimal but if there's any way this could be optimized I'd like to know.

Why not use simplexml_load_string?

Mob
– Mob

2011-11-04 15:45:43 +00:00
Commented Nov 4, 2011 at 15:45 — Mob
– Mob, Commented Nov 4, 2011 at 15:45

sascha · Accepted Answer · 2011-11-04 15:45:14Z

2

This does the same, but looks a bit more elegeant

<?php

$xml = array('stockholm' => 906057, 'alicante' => 752101, 'marbella' => 766537, 'torrevieja' => 775868);

foreach($xml as $city => $code) {
    $smplxml = simplexml_load_file('http://weather.yahooapis.com/forecastrss?w=' .$code. '&u=c');
    $smplxml->registerXpathNamespace('yweather', 'http://xml.weather.yahoo.com/ns/rss/1.0');
    $children = $smplxml->xpath('//channel/item/yweather:condition'); 
    echo '<li><img class="c' . $children[0]['code'] . '" src="img/spacer.gif" alt=""><h2>' . $children[0]['temp'] . '&deg;</h2><p><strong>' .$city. '</strong></p></li>';
}

?>

(since I'm behind a proxy right now, I wasn't able to test it, sorry, but it may helps)

answered Nov 4, 2011 at 15:45

sascha

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2 Comments

Mob Over a year ago

cURL supports proxy, just in case.

Staffan Estberg Over a year ago

Thanks. I'm not sure it helped in decreasing the load speed for the actual feeds but using the array really cleaned up the code.

mobius · Accepted Answer · 2011-11-04 16:02:13Z

Well if you did something like:

function curlGet( $url ) {
   $ch = curl_init(); 
   curl_setopt($ch, CURLOPT_URL, $url); 
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
   $output = curl_exec($ch); 

   curl_close($ch); 

   return $output;
}

$xml = array('stockholm' => 906057, 'alicante' => 752101, 'marbella' => 766537, 'torrevieja' => 775868);

$buffer = "<rsses>";

foreach($xml as $city => $code)
  $buffer .= curlGet('http://weather.yahooapis.com/forecastrss?w=' .$code. '&u=c');

$buffer .= "</rsses>";

$smplxml = simplexml_load_string($buffer);
$smplxml->registerXpathNamespace('yweather', 'http://xml.weather.yahoo.com/ns/rss/1.0');
$children = $smplxml->xpath('//rss/channel/item/yweather:condition'); 

print_r($children);

Might work. You need to make sure that the data you add to $buffer is not junk though. Or otherwise your entire parsing will fail.

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