How to convert ssh command 'df -h' result in json format?

Question

I am using phpseclib SSH2 to connect ec2 server. I want to get disk space details in json format. I run the command as below:

$command = "df -h"; 
echo $ssh->exec($command);

Output is:

Filesystem Size Used Avail Use% Mounted on devtmpfs 475M 0 475M 0% /dev tmpfs 483M 0 483M 0% /dev/shm tmpfs 483M 552K 483M 1% /run tmpfs 483M 0 483M 0% /sys/fs/cgroup /dev/xvda1 30G 2.5G 28G 9% / fs-035d9649ed9793406.efs.us-east-1.amazonaws.com:/ 8.0E 0 8.0E 0%  /var/www/html/efsmount/Customer1 /dev/mapper/customervolumegroup-Cus2 5.0G 38M 5.0G 1% /var/www/html/efsmount/Cus2 /dev/mapper/customervolumegroup-Cus3 5.0G 38M 5.0G 1% /var/www/html/efsmount/Cus3 /dev/mapper/customervolumegroup-Cus4 5.0G 38M 5.0G 1% /var/www/html/efsmount/Cus4 tmpfs 97M 0 97M 0% /run/user/1000

The result is in string format. How to convert this to json format?

Answer 1

I convert the above output into array first.

        $command = "df -h"; 
        $s= $ssh->exec($command);
        $data = trim($s);

        $data = array_map(function($line){
            $elements=preg_split('/\s+/',$line);
            return(array(
            'filesystem' => $elements[0],
            'size' => $elements[1],
            'used' => $elements[2],
            'available' => $elements[3],
            'use%' => $elements[4],
            ));
    },explode("\n",$data));

Then encode this into json.