Demon shell_exec("nohup $PLAYSMSD

I am doing walk through in code

  1. In demon shell_exec(“nohup $PLAYSMSD_COMMAND ratesmsd >/dev/null 2>&1 &”);
    where is ratesmsd defined

function rate_update() {

return core_call_hook();

core_call_hook how this works ? Any document available please?

Its a placeholder where plugins can hook to that function and be called when rate_update() called.

Use mc and find PHP file containing word rate_update.