<?php $arr = [0=> 'foo', 2 => 'bar', 'lol' => 'lorem'];
Standard input is empty
array(3) {
[0]=>
string(3) "foo"
[2]=>
string(3) "bar"
["lol"]=>
string(5) "lorem"
}
array(3) {
[0]=>
string(3) "bar"
[1]=>
string(3) "foo"
["lol"]=>
string(5) "lorem"
}