[ 0 => [ 0 => 1, 1 => 'hello', 2 => 1, 3 => 'world', 4 => 'hello', ],]
[ 'result' => [ 'array' => [ 1 => 2, 'hello' => 2, 'world' => 1, ], ], 'php_version' => '7.1.33 Linux x86_64',]