gistfile1.txt

$ php demo.php
array(2) {
  ["coolection"]=>
  array(3) {
    ["memory_before"]=>
    int(33828416)
    ["memory_after"]=>
    int(33879160)
    ["delta"]=>
    int(50744)
  }
  ["collection"]=>
  array(3) {
    ["memory_before"]=>
    int(24765168)
    ["memory_after"]=>
    int(24876568)
    ["delta"]=>
    int(111400)
  }
}
array(2) {
  ["coolection"]=>
  array(4) {
    ["memory_before"]=>
    int(33881528)
    ["memory_after"]=>
    int(34256256)
    ["memory_delta"]=>
    int(374728)
    ["execution_delta"]=>
    float(0.0054190158843994)
  }
  ["collection"]=>
  array(4) {
    ["memory_before"]=>
    int(34258016)
    ["memory_after"]=>
    int(35091744)
    ["memory_delta"]=>
    int(833728)
    ["execution_delta"]=>
    float(0.023321151733398)
  }
}