[ 0 => '1.234', 1 => '5',]
[ 'result' => [ 'string' => '-3', ], 'php_version' => '7.1.33 Linux x86_64',]
[ 0 => '1.234', 1 => '5', 2 => 4,]
[ 'result' => [ 'string' => '-3.7660', ], 'php_version' => '7.1.33 Linux x86_64',]