--TEST--
Twig supports array notation
--TEMPLATE--
{# empty array #}
{{ []|join(',') }}

{{ [1, 2]|join(',') }}
{{ ['foo', "bar"]|join(',') }}
{{ {0: 1, 'foo': 'bar'}|join(',') }}
{{ {0: 1, 'foo': 'bar'}|keys|join(',') }}

{{ {0: 1, foo: 'bar'}|join(',') }}
{{ {0: 1, foo: 'bar'}|keys|join(',') }}

{# nested arrays #}
{% set a = [1, 2, [1, 2], {'foo': {'foo': 'bar'}}] %}
{{ a[2]|join(',') }}
{{ a[3]["foo"]|join(',') }}

{# works even if [] is used inside the array #}
{{ [foo[bar]]|join(',') }}

{# elements can be any expression #}
{{ ['foo'|upper, bar|upper, bar == foo]|join(',') }}

{# arrays can have a trailing , like in PHP #}
{{
  [
    1,
    2,
  ]|join(',')
}}

{# keys can be any expression #}
{% set a = 1 %}
{% set b = "foo" %}
{% set ary = { (a): 'a', (b): 'b', 'c': 'c', (a ~ b): 'd' } %}
{{ ary|keys|join(',') }}
{{ ary|join(',') }}
--DATA--
return ['bar' => 'bar', 'foo' => ['bar' => 'bar']]
--EXPECT--
1,2
foo,bar
1,bar
0,foo

1,bar
0,foo

1,2
bar

bar

FOO,BAR,

1,2

1,foo,c,1foo
a,b,c,d