a1 + a1 : Array
(
[0] => a
[1] => b
)
array_merge(a1, a1) : Array
(
[0] => a
[1] => b
[2] => a
[3] => b
)
a1 + a2 : Array
(
[0] => a
[1] => b
[foo] => a
[bar] => b
)
array_merge(a1, a2) : Array
(
[0] => a
[1] => b
[foo] => a
[bar] => b
)
a1 + a3 : Array
(
[0] => a
[1] => b
)
array_merge(a1, a3) : Array
(
[0] => a
[1] => b
[2] => c
[3] => d
)
a1 + a4 : Array
(
[0] => a
[1] => b
[zip] => c
[qux] => d
)
array_merge(a1, a4) : Array
(
[0] => a
[1] => b
[zip] => c
[qux] => d
)
a2 + a1 : Array
(
[foo] => a
[bar] => b
[0] => a
[1] => b
)
array_merge(a2, a1) : Array
(
[foo] => a
[bar] => b
[0] => a
[1] => b
)
a2 + a2 : Array
(
[foo] => a
[bar] => b
)
array_merge(a2, a2) : Array
(
[foo] => a
[bar] => b
)
a2 + a3 : Array
(
[foo] => a
[bar] => b
[0] => c
[1] => d
)
array_merge(a2, a3) : Array
(
[foo] => a
[bar] => b
[0] => c
[1] => d
)
a2 + a4 : Array
(
[foo] => a
[bar] => b
[zip] => c
[qux] => d
)
array_merge(a2, a4) : Array
(
[foo] => a
[bar] => b
[zip] => c
[qux] => d
)
a3 + a1 : Array
(
[0] => c
[1] => d
)
array_merge(a3, a1) : Array
(
[0] => c
[1] => d
[2] => a
[3] => b
)
a3 + a2 : Array
(
[0] => c
[1] => d
[foo] => a
[bar] => b
)
array_merge(a3, a2) : Array
(
[0] => c
[1] => d
[foo] => a
[bar] => b
)
a3 + a3 : Array
(
[0] => c
[1] => d
)
array_merge(a3, a3) : Array
(
[0] => c
[1] => d
[2] => c
[3] => d
)
a3 + a4 : Array
(
[0] => c
[1] => d
[zip] => c
[qux] => d
)
array_merge(a3, a4) : Array
(
[0] => c
[1] => d
[zip] => c
[qux] => d
)
a4 + a1 : Array
(
[zip] => c
[qux] => d
[0] => a
[1] => b
)
array_merge(a4, a1) : Array
(
[zip] => c
[qux] => d
[0] => a
[1] => b
)
a4 + a2 : Array
(
[zip] => c
[qux] => d
[foo] => a
[bar] => b
)
array_merge(a4, a2) : Array
(
[zip] => c
[qux] => d
[foo] => a
[bar] => b
)
a4 + a3 : Array
(
[zip] => c
[qux] => d
[0] => c
[1] => d
)
array_merge(a4, a3) : Array
(
[zip] => c
[qux] => d
[0] => c
[1] => d
)
a4 + a4 : Array
(
[zip] => c
[qux] => d
)
array_merge(a4, a4) : Array
(
[zip] => c
[qux] => d
)