[ 0 => [ 0 => 'this', 1 => 'is', 2 => 'an array', ],]
[ 'result' => [ 'bool' => true, ], 'php_version' => '7.1.33 Linux x86_64',]
'this is a string'
[ 'result' => [ 'bool' => false, ], 'php_version' => '7.1.33 Linux x86_64',]