gistfile1.php

<?php

 if (in_array($name, array_keys($this->calls))) {
    if ($this->$name($data)) {
      return $this->dialIn($name, $data);
    }
  } else {

    return "Non-existent call";
  }
  
  
  

gistfile2.php

<?php

if (!in_array($name, array_keys($this->calls)) || !$this->$name($data)) {
  return "Non-existent call";
}
  
return $this->dialIn($name, $data);