php find xml node thanks to isset variable form url [closed] - xpath

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Closed 9 years ago.
I have a single.php page where I want to load individual post.
To do this I have some links in my index.php that allows to load single.php page :
Post 12
Post 11
Post 10
I get the variable in the url in my single.php page and I want to find (and display), in a xml file, the element that correspond to this variable:
<?php
if(isset($_GET["blog_no"])) {
$i = $_GET["blog_no"];
$elements = new SimpleXMLElement('data.xml', null, true);
$query = $elements->xpath(" /elements/element[#id='$i'] ");
foreach($query as $element) {
echo $elements->element['size'];
echo $elements->element['category'];
echo $elements->element->title;
}
?>
Here an example of my xml file:
<elements>
<element id="12" size="square" category="portfolio">
<tag tag="printer printing 3d apple iphone 5 bumper case"></tag>
<icon class="icon-picture"></icon>
<urlpage url="/contact/contact.html"></urlpage>
<urlimage src='./Post thumbnail images/01.png'></urlimage>
<date date="8 Apr"></date>
<title>Minimal Bumper for iPhone 5 : Protect your iphone with a lightwheight and protect full case </title>
</element>
<element id="11" size="normal" category="portfolio">
<tag tag="printer printing 3d apple iphone 5 case slim"></tag>
<icon class="icon-picture"></icon>
<urlpage url="/portfolio/11.html"></urlpage>
<urlimage src='./Post thumbnail images/tape-dribbble.jpg'></urlimage>
<date date="21 Jan"></date>
<title>UltraSlim case</title>
</element>
</elements>
But nothing works.

Answer 1

You were quite close to it, do it like this:
if (isset($_GET['blog_no'])) {
$id = $_GET['blog_no'];
$xml = simplexml_load_string($x); // assume XML in $x
$element = $xml->xpath("//element[#id='$id']")[0];
echo "$element[size] - $element[category]<br />$element->title<br />";
} else {
echo "No post selected!"
}
Explanation:
in xpath, //element means to select every <element> at any position in the XML
xpath will always return an array, the [0] will select only the 1st match. This syntax will work in PHP >=5.4, if you're below, let me know and I'll post the right code.
No need for foreach, there can only be one <element> selected, because the id is unique (I guess).
See it working: http://codepad.viper-7.com/LY3itL

Answer 2

I found a solution :
if(isset($_GET["blog_no"])) {
if (file_exists('data.xml')) {
$elements = new SimpleXMLElement('data.xml', null, true);
foreach ($elements->element as $element) {
if ($element['id'] == $_GET["blog_no"]) {
echo $element['size'];
echo $element['category'];
echo $element->title;
break;
}
}
}else {
exit('Failed to open data.xml.');
}
}
I don't know if it's the best way to do it but it works great.

Answer 3

How about this...
<?php
if (isset($_GET['blog_no']))
{
$i = $_GET['blog_no'];
if (file_exists('data.xml'))
{
$xml = simplexml_load_file('data.xml');
$query = '/elements/element[#id="'.$i.'"]';
$elements = $xml->xpath($query);
foreach ($elements as $element)
{
echo $element['size'];
echo $element['category'];
echo $element->title;
}
}
else
{
exit('Failed to open data.xml.');
}
}
?>
See above Xpath working here: codepad.viper-7.com/QgYeqK.
Thanks go to #michi for introducing codepad.viper-7.com.