screen_name="my_screen"
server_count=5
# screen_binary="screen"
screen_binary="byobu-screen"
 
# Start screen in detached mode with a session name.
screen -S "${screen_name}" -t "master" -d -m
 
# Wait for screen to be ready before opening new sessions.
sleep 1
 
# Create tabs and send commands to each.
for i in $(seq 1 "${server_count}"); do
    # Create tab.
    screen -S "${screen_name}" -X "screen" -t "my_screen_${i}"
 
    # Start development server in tab.
    port=8000
    (( port += $i ))
    command="php -S 127.0.0.1:${port}"
    screen -S "${screen_name}" -p "my_screen_${i}" -X stuff "${command}"$'\n'
done
 
screen -r "${screen_name}"

php -S 127.0.0.1:8001
php -S 127.0.0.1:8002
php -S 127.0.0.1:8003
php -S 127.0.0.1:8004
php -S 127.0.0.1:8005