$array
=
[
'color' => 'green',
0 => 2,
1 => 4,
2 => 'a',
3 => 'b',
'shape' => 'trapezoid',
4 => 4,
]
#1
|
array_merge
|
([0 => "foo"], |
#2
|
array_merge
|
(["color" => "red", 0 => 2, 1 => 4], |
#3
|
array_merge
|
([], |