[ 0 => 1.234, 1 => 5,]
[ 'result' => [ 'string' => '6', ], 'php_version' => '7.1.33 Linux x86_64',]
[ 0 => 1.234, 1 => 5, 2 => 4,]
[ 'result' => [ 'string' => '6.2340', ], 'php_version' => '7.1.33 Linux x86_64',]