PHP从对象获取带有值的键

Question

I am using simplexml_load_string() in PHP to parse my XML File.
Now, for better reading, I json_encode() d my object: http://pastebin.com/Hk8YCssR (Example Representation Plan of a german School)
I want one object with all actions in it and one with all keys of the "head".
I tried to loop through these keys, but I wasn't abled to get the value of a keys key, eg:

"action":[  
     {  
        "class":"5/2",
        "period":"5",
        ...

In this case, to get the value "5/2".

I don't have the exact code, but I am writing in sketch what I've done:

$value = current((array)$xml);
echo $value;

foreach ($xml as $key) {
  // echo $key[];
}

---

PS: Thank you for reading this

Answer 1

Try this:

$sv_infch=get_object_vars($xml[0]->info);
foreach($sv_infch as $key => $value) {
    print "$key => $value\n";
    echo "{$key} => {$value} ";
    print_r($sv_infch);
}