How looks good structure of construct for creating multidimensial array - php

Question

I am trying to create constructor which creates an multidimensional array. My result should be like this:-
Checkout my array $result_array
For now I have error: Illegal offset type. Note that I have als use __toString() becose I work on xml data.
class Property {
public $xmlClass;
public $elemClass = '';
public $first_array = array();
public $result_array = array();
public $data = '';
public $data2 = '';
public function __construct($xml, $elem) {
$this->xmlClass = $xml;
$this->elemClass = $elem;
foreach ($xml->xpath('//*[#baza]') as $val) {
$this->first_array[] = $val;
foreach ($val->ksiazka as $value) {
$data = $value->$elem->__toString();
$this->result_array[$this->first_array][] = $data;
}
}
}
public function getResult() {
return $this->result_array;
}
}
$result_autor = new Property($xml, 'autor');
$autor = $result_autor->getResult();

Answer 1

You need to change your two foreach() like below:-
foreach($xml->xpath('//*[#baza]') as $val) {
//$this->first_array[] = $val; not needed
foreach($val->ksiazka as $key=> $value){ //check $key here
$data = $value->$elem->__toString();
$this->result_array[$key][] = $data; // add $key hear
}
}
If the above not worked then check this too:-
foreach($xml->xpath('//*[#baza]') as $key=> $val) { //check $key here
//$this->first_array[] = $val; not needed
foreach($val->ksiazka as $value){
$data = $value->$elem->__toString();
$this->result_array[$key][] = $data; // add $key hear
}
}