How to remove/get parameters from XML?

Question

PHP

We take a file like this:

...
<offers>
<offer id="17" available="true">
<url>test.ru</url>
<name>тестовый элемент</name>
<param name="Вес">27</param>
<param name="Длина">16</param>
<param name="Хрупкий"/>
<param name="Синий">Да</param>
</offer>
<offer id="18" available="false">
<url>test2.ru</url>
<name>тестовый элемент2</name>
<param name="Вес">11</param>
<param name="Длина">89</param>
<param name="Жидкий"/>
<param name="Синий">Нет</param>
</offer>
.....

I am uploading a file:

$ourfile = simplexml_load_file($name, 'SimpleXMLElement', LIBXML_NOBLANKS);

In it I can refer to the element, for example, remove the link I don’t need

foreach ($ourfile->offers->offer as $offer) {unset($offer->url);}

Or display / replace the values ​​\u200b\u200bthat I need. But with "param" I'm doing something wrong.
$offer->param["name"] - displays the name of the parameter, I mastered it.
I need:

• Remove parameter where length is specified
  
• Output weight to variable
  
• Find out if it's fragile
  

Actually I would like to know how to do it right.

Answer 1

You need XPath .
Gaining weight:
Then I think you can do it yourself.

Answer 2

foreach ($item->param as $param){
$param = (array)$param;
print_r($param["@attributes"]["name"]);
print_r($param[0]);
}