src/PAMI/Message/Message.php
protected function setKey($key, $value)
    {
        $key = strtolower((string)$key);
        $this->keys[$key] = (string)$value;
    }
protected function setKey($key, $value)
    {
        $key = strtolower((string)$key);
        $this->keys[$key] = (string)$value;
    }
protected function setKey ( $ key , $ value ) { $ key = strtolower ( ( string ) $ key ) ; $ this -> keys [ $ key ] = ( string ) $ value ; }
Adds a variable to this message.

@param string $key   Key name (i.e: Action).
@param string $value Key value.

@return void
Adds a variable to this message .