Look up commands by name and invoke the associated function

invoke-command.php

<?php

class WP_SMS_PLUGIN {
  var $commands = array(
    'post' => array( __CLASS__, 'post_message' ),
    'get'  => array( __CLASS__, 'get_recent_posts' )
  );
  
  public function add_command( $command, $callback ) {
    $commands[$command] = $callback;
  }
  
  public function execute_command($parsed_sms){
    $command = $parsed_sms[1];
    if ( isset( $this->commands[$command] ) ) {
      call_user_func( $this->commands[$command], $parsed_sms );
    } else {
      $this->send_sms("unrecognized command");
    }
  }
}