How do I loop through multiple child nodes of XML? - php

Question

I am having some trouble trying to loop through an XML document. The XML looks like this:
<data>
<weather>
<hourly>
<time>0</time>
<tempC>17</tempC>
<tempF>62</tempF>
<windspeedMiles>24</windspeedMiles>
<windspeedKmph>39</windspeedKmph>
</hourly>
<hourly>
<time>3</time>
<tempC>16</tempC>
<tempF>60</tempF>
<windspeedMiles>22</windspeedMiles>
<windspeedKmph>35</windspeedKmph>
</hourly>
</weather>
<weather>
<hourly>
<time>0</time>
<tempC>17</tempC>
<tempF>62</tempF>
<windspeedMiles>24</windspeedMiles>
<windspeedKmph>39</windspeedKmph>
</hourly>
<hourly>
<time>3</time>
<tempC>16</tempC>
<tempF>60</tempF>
<windspeedMiles>22</windspeedMiles>
<windspeedKmph>35</windspeedKmph>
</hourly>
</weather>
</data>
My code (below) whilst it loops through all 'weather' nodes, it only picks out the first 'hourly' child node and completely skips the second. Would someone be able to help me as if I am honest, I do not know enough about looping to fix it and its driving me nuts! Grr.
Here is my PHP code which loads an XML document from online and then formats the XML results into div tags and obviously loops through the XML but as I said only loops through the first 'hourly' node of each 'weather' node.
<?php
// load SimpleXML
$data = new SimpleXMLElement('myOnlineXMLdocument.xml', null, true);
echo <<<EOF
<div class="observationRow">
<div class="observationTitleSmall"><br>Time</div>
<div class="observationTitleSmall"><br>Temp C</div>
<div class="observationTitleSmall"><br>Temp F</div>
<div class="observationTitleSmall"><br>Wind Speed MPH</div>
<div class="observationTitleSmall"><br>Wind Speed KMPH</div>
</div>
EOF;
foreach($data as $weather) // loop through our hours
{
echo <<<EOF
<div>
<div class="observationCellSmall"><br>{$weather->time}</div>
<div class="observationCellSmall"><br>{$weather->tempC}</div>
<div class="observationCellSmall"><br>{$weather->tempF}</div>
<div class="observationCellSmall"><br>{$weather->hourly->windspeedMiles}</div>
<div class="observationCellSmall"><br>{$weather->hourly->windspeedKmph}</div>
EOF;
}
echo '</div>';
?>

Answer 1

EDITED CODE:
$str = "";
foreach($data->weather as $weather)
{
foreach ($weather->hourly as $hour)
{
$str .= "
<div>";
if ($hour->time == "0") {
$str .= "
<div class='observationCellSmall'><br>$weather->date</div>
<div class='observationCellSmall'><br>$weather->maxtempC</div>
<div class='observationCellSmall'><br>$weather->mintempC</div>";
}
$str .= "
<div class='observationCellSmall'><br>$hour->time</div>
<div class='observationCellSmall'><br>$hour->tempC</div>
<div class='observationCellSmall'><br>$hour->tempF</div>
<div class='observationCellSmall'><br>$hour->windspeedMiles</div>
<div class='observationCellSmall'><br>$hour->windspeedKmph</div>
</div>
";
}
}
echo $str;
Using a slenderized version of your XML feed, that generates this:
<div>
<div class='observationCellSmall'><br>2013-08-19</div>
<div class='observationCellSmall'><br>17</div>
<div class='observationCellSmall'><br>15</div>
<div class='observationCellSmall'><br>0</div>
<div class='observationCellSmall'><br>15</div>
<div class='observationCellSmall'><br>59</div>
<div class='observationCellSmall'><br>11</div>
<div class='observationCellSmall'><br>18</div>
</div>
<div>
<div class='observationCellSmall'><br>300</div>
<div class='observationCellSmall'><br>15</div>
<div class='observationCellSmall'><br>59</div>
<div class='observationCellSmall'><br>13</div>
<div class='observationCellSmall'><br>21</div>
</div>
<div>
<div class='observationCellSmall'><br>2013-08-20</div>
<div class='observationCellSmall'><br>21</div>
<div class='observationCellSmall'><br>16</div>
<div class='observationCellSmall'><br>0</div>
<div class='observationCellSmall'><br>17</div>
<div class='observationCellSmall'><br>62</div>
<div class='observationCellSmall'><br>11</div>
<div class='observationCellSmall'><br>18</div>
</div>
<div>
<div class='observationCellSmall'><br>300</div>
<div class='observationCellSmall'><br>16</div>
<div class='observationCellSmall'><br>61</div>
<div class='observationCellSmall'><br>10</div>
<div class='observationCellSmall'><br>17</div>
</div>

Answer 2

You need a nested loop. One to loop over the weathers, and and another to loop over the hourlies.
foreach($data->weather as $weather) {
foreach($weather->hourly as $hourly) {
// code here
}
}
I don't remember the simplexml API 100% off my head, if that doesn't work you might need to use ->getChildren() or something to make it iterable.
Either that, or use xpath and nab the hourlies directly: /data/weather/hourly.