Read long xml with php [closed] - php

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i have a problem with reading my xml. By code down i read xml, bud how i say at the end of this post, i need read subelements. But i don't know how.
$reader = new XMLReader();
$reader->open("data/sns.xml");
while($reader->read()){
if ($reader->nodeType == XMLReader::ELEMENT && $reader->name == "item" && $reader->getAttribute('sensor') == "th0" && $reader->getAttribute('cat') == "temp" && $reader->getAttribute('unit') == "c") {
echo "Venkovní teplota: ".$reader->readString()." °C";
echo "<br />";
}
if($reader->nodeType == XMLReader::ELEMENT && $reader->name == "item" && $reader->getAttribute("sensor") == "th0" && $reader->getAttribute("cat") == "hum" && $reader->getAttribute("unit") == "rel"){
echo "venkovní vlhkost: ".$reader->readString();
echo "<br />";
}}
I can read this, but my xml looks like:
<data timeframe="actual">
<item sensor="system" cat="version" unit="text">4.9u</item>
<item sensor="system" cat="version" unit="num">49</item>
<item sensor="system" cat="build" unit="num">1261</item>
<item sensor="system" cat="platform" unit="text">SilverStone_DC01</item>
<item sensor="system" cat="language" unit="text">Czech</item>
<item sensor="system" cat="temp" unit="unit">c</item>
<item sensor="system" cat="hum" unit="unit">rel</item>
<item sensor="system" cat="press" unit="unit">hpa</item>
<item sensor="system" cat="wind" unit="unit">ms</item>
<item sensor="system" cat="rain" unit="unit">mm</item>
<item sensor="date0" cat="date" unit="utc">20160111090606</item>
<item sensor="date0" cat="date2" unit="utc">11.01.2016 09:06:06</item>
<item sensor="date0" cat="puredate" unit="utc">11.01.2016</item>
<item sensor="date0" cat="time" unit="utc">09:06:06</item>
<item sensor="date0" cat="year" unit="utc">2016</item>
<item sensor="date0" cat="month" unit="utc">01</item>
<item sensor="date0" cat="day" unit="utc">11</item>
<item sensor="date0" cat="dayofweek" unit="utc">1</item>
<item sensor="date0" cat="hour" unit="utc">09</item>
<item sensor="date0" cat="min" unit="utc">06</item>
<item sensor="date0" cat="sec" unit="utc">06</item>
<item sensor="date0" cat="date" unit="local">20160111100606</item>
<item sensor="date0" cat="date2" unit="local">11.01.2016 10:06:06</item>
<item sensor="date0" cat="puredate" unit="local">11.01.2016</item>
<item sensor="date0" cat="time" unit="local">10:06:06</item>
<item sensor="date0" cat="year" unit="local">2016</item>
<item sensor="date0" cat="month" unit="local">01</item>
<item sensor="date0" cat="day" unit="local">11</item>
</data>
and i need read for example. sensor: date0 and cat: date2 and unit: utc and now show me a string.
When you are looking for this code u say it is easy, but in my xml i have next tag
<data timeframe="lastday"></data>
and the same items, bud i need to read only actual.
Please help.
Thank You

Answer 1

Make yourself familiar with SimpleXML and xpath, with these your task is very simple:
<?php
$string = __your_xml_string_here;
$xml = simplexml_load_string($string);
$sensors = $xml->xpath("//item[#sensor='date0']");
print_r($sensors);
# or loop over them with foreach
foreach ($sensors as $sensor) {
// do sth. useful here
// the full string can be obtained with
// $sensor->asXML() or $sensor->__toString()
}
?>