PHP foreach add array onto the end of the array that the foreach loop is running through

Question

I am guessing I am doing this completely wrong but I want to add an array onto the end of the arrays which the foreach loop is running through.

E.g this is the start result

 array(3) {
   [0]=>
   array(1) {
   ["name"]=>
   string(7) "Matthew"
   }
  [1]=>
   array(1) {
   ["name"]=>
   string(3) "Jim"
   }
   [2]=>
  array(1) {
   ["name"]=>
    string(3) "Sam"
  }
}

This is the code im using

<?php

  $arr = array( array("name" => "Matthew"), array("name" => "Jim"), array("name" => "Sam"));

  foreach ($arr as $element) {

  $ages = array("test" => 12);

  $element['test'] = $ages;

}

?>

The desired end result

    array(3) {
   [0]=>
   array(1) {
   ["name"]=>
   string(7) "Matthew",
   array(1) {
   ["test"]=>
    int(2) 12
  }
   }
  [1]=>
   array(1) {
   ["name"]=>
   string(3) "Jim",
    array(1) {
   ["test"]=>
    int(2) 12
  }
   }
   [2]=>
  array(1) {
   ["name"]=>
    string(3) "Sam",
   array(1) {
   ["test"]=>
    int(2) 12
  }
  }
}

Answer 1

Try this

foreach ($arr as $key=>$val) {
    $ages = array("test" => 12);
    $arr[$key]['test'] = $ages;
}

result is

Array (
    [0] => Array
        (
            [name] => Matthew
            [test] => Array
                (
                    [test] => 12
                )
        )
    [1] => Array
        (
            [name] => Jim
            [test] => Array
                (
                    [test] => 12
                )
        )
    [2] => Array
        (
            [name] => Sam
            [test] => Array
                (
                    [test] => 12
                )
        ) )