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PODynamically Access XML Variable with PHP
 

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  1. PODynamically Access XML Variable with PHP
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    <p>I am attempting to create a PHP query that can access an XML feed using dynamic variables within the query.</p> <pre><code>$xml = new SimpleXMLElement($row['feed_result']); $a = 'Sensor'; $b = 'Condition'; $c = 'LastReading'; echo 'Sensor 1 : '.$xml-&gt;{$a}[0]-&gt;{$b}[6]-&gt;{$c}.'&lt;br /&gt;'; </code></pre> <p>This is working for me, i.e. I am getting the correct value as a response from Sensor 1. However, I am totally stuck in terms of trying to make the [0] and [6] part of the dynamic query. For example, if I change the code like so the query fails and I get no response,</p> <pre><code>$xml = new SimpleXMLElement($row['feed_result']); $a = 'Sensor[0]'; $b = 'Condition[6]'; $c = 'LastReading'; echo 'Sensor 1 : '.$xml-&gt;{$a}-&gt;{$b}-&gt;{$c}.'&lt;br /&gt;'; </code></pre> <p>My question is how can make the section within the square brackets part of the dynamic query? Why won't the query work when the square brackets are part of a variable?</p> <p>The XML looks like this:</p> <pre><code>&lt;CurrentConditions xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" Name="" Status="0" Latitude="0.0" Longitude="0.0" Units="Metric"&gt; &lt;Sensor Name="sensor01" Port="1" Status="0"&gt; &lt;Condition Type="Humidity"&gt; &lt;DateReceived&gt;2013-06-30T17:42:59.237Z&lt;/DateReceived&gt; &lt;LastReading&gt;56.00&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;56.00 %&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Humidity"&gt; &lt;DateReceived&gt;2013-06-30T17:45:20.66Z&lt;/DateReceived&gt; &lt;LastReading&gt;57.00&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;57.00 %&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T08:45:38.593Z&lt;/DateReceived&gt; &lt;LastReading&gt;25.20&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;25.20 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T08:50:51.36Z&lt;/DateReceived&gt; &lt;LastReading&gt;25.30&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;25.30 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T08:56:02.283Z&lt;/DateReceived&gt; &lt;LastReading&gt;25.30&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;25.30 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T09:01:14.313Z&lt;/DateReceived&gt; &lt;LastReading&gt;25.30&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;25.30 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T09:06:26.797Z&lt;/DateReceived&gt; &lt;LastReading&gt;25.30&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;25.30 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;/Sensor&gt; &lt;Sensor Name="sensor02" Port="2" Status="0"&gt; &lt;Condition Type="Humidity"&gt; &lt;DateReceived&gt;2013-07-27T08:45:38.593Z&lt;/DateReceived&gt; &lt;LastReading&gt;17.00&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;17.00 %&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T08:45:38.593Z&lt;/DateReceived&gt; &lt;LastReading&gt;44.10&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;44.10 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Humidity"&gt; &lt;DateReceived&gt;2013-07-27T08:50:51.36Z&lt;/DateReceived&gt; &lt;LastReading&gt;18.00&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;18.00 %&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T08:50:51.36Z&lt;/DateReceived&gt; &lt;LastReading&gt;44.40&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;44.40 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Humidity"&gt; &lt;DateReceived&gt;2013-07-27T08:56:02.283Z&lt;/DateReceived&gt; &lt;LastReading&gt;18.00&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;18.00 %&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T08:56:02.283Z&lt;/DateReceived&gt; &lt;LastReading&gt;44.90&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;44.90 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Humidity"&gt; &lt;DateReceived&gt;2013-07-27T09:01:14.313Z&lt;/DateReceived&gt; &lt;LastReading&gt;17.00&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;17.00 %&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T09:01:14.313Z&lt;/DateReceived&gt; &lt;LastReading&gt;44.40&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;44.40 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Humidity"&gt; &lt;DateReceived&gt;2013-07-27T09:06:26.797Z&lt;/DateReceived&gt; &lt;LastReading&gt;16.00&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;16.00 %&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;Condition Type="Temperature"&gt; &lt;DateReceived&gt;2013-07-27T09:06:26.797Z&lt;/DateReceived&gt; &lt;LastReading&gt;45.80&lt;/LastReading&gt; &lt;LastReadingDisplay&gt;45.80 C&lt;/LastReadingDisplay&gt; &lt;/Condition&gt; &lt;/Sensor&gt; &lt;/CurrentConditions&gt; </code></pre> <p>Thanks</p>
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