[ 0 => [ 0 => 1, 1 => 2, 2 => [ 0 => 'a', 1 => 'b', 2 => 'c', ], ],]
[ 'result' => [ 'contents' => 'array(3) { [0]=> int(1) [1]=> int(2) [2]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" }}', ], 'php_version' => '7.1.33 Linux x86_64',]
[ 0 => 3.1, 1 => true,]
[ 'result' => [ 'contents' => 'float(3.1)bool(true)', ], 'php_version' => '7.1.33 Linux x86_64',]