echo specific part of xml string - php

Question

Assume i have the following xml:
<?xml version="1.0" encoding="UTF-8"?>
<products>
<product>
<id>1</id>
<name>Apple iPhone 7</name>
</product>
<product>
<id>2</id>
<name>Samsung Galaxy S7</name>
</product>
</products>
With the following code, I'm able to print the whole xml-string:
$xml = simplexml_load_string($string);
echo '<pre>'.htmlentities($xml->asXML()).'</pre>';
I'm now looking for code to echo a specific part of the xml string, let's say product[0].
I want to be able to echo it as follows:
<product>
<id>1</id>
<name>Apple iPhone 7</name>
</product>
Anyone knows the solution?

Answer 1

You can use this functions:
<?php
function xml2ary(&$string) {
$parser = xml_parser_create();
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
xml_parse_into_struct($parser, $string, $vals, $index);
xml_parser_free($parser);
$mnary=array();
$ary=&$mnary;
foreach ($vals as $r) {
$t=$r['tag'];
if ($r['type']=='open') {
if (isset($ary[$t])) {
if (isset($ary[$t][0])) $ary[$t][]=array(); else $ary[$t]=array($ary[$t], array());
$cv=&$ary[$t][count($ary[$t])-1];
} else $cv=&$ary[$t];
if (isset($r['attributes'])) {foreach ($r['attributes'] as $k=>$v) $cv['_a'][$k]=$v;}
$cv['_c']=array();
$cv['_c']['_p']=&$ary;
$ary=&$cv['_c'];
} elseif ($r['type']=='complete') {
if (isset($ary[$t])) { // same as open
if (isset($ary[$t][0])) $ary[$t][]=array(); else $ary[$t]=array($ary[$t], array());
$cv=&$ary[$t][count($ary[$t])-1];
} else $cv=&$ary[$t];
if (isset($r['attributes'])) {foreach ($r['attributes'] as $k=>$v) $cv['_a'][$k]=$v;}
$cv['_v']=(isset($r['value']) ? $r['value'] : '');
} elseif ($r['type']=='close') {
$ary=&$ary['_p'];
}
}
_del_p($mnary);
return $mnary;
}
// _Internal: Remove recursion in result array
function _del_p(&$ary) {
foreach ($ary as $k=>$v) {
if ($k==='_p') unset($ary[$k]);
elseif (is_array($ary[$k])) _del_p($ary[$k]);
}
}
$string = '<?xml version="1.0" encoding="UTF-8"?>
<products>
<product>
<id>1</id>
<name>Apple iPhone 7</name>
</product>
<product>
<id>2</id>
<name>Samsung Galaxy S7</name>
</product>
</products>';
$requeststring = xml2ary($string);
echo $requeststring["products"]["_c"]["product"][0]["_c"]["id"]["_v"]; //outputs 1
?>
Just change ["products"] or ["product"] or ["id"] for your own result.