public function get($alias)
    {
        return isset($this->services[$alias]) ? $this->services[$alias] : null;
    }
public function get($alias)
    {
        return isset($this->services[$alias]) ? $this->services[$alias] : null;
    }
public function get ( $ alias ) { return isset ( $ this -> services [ $ alias ] ) ? $ this -> services [ $ alias ] : null ; }
Get a tagged service from its alias

@author Vincent Chalamon <vincentchalamon@gmail.com>
@param  string      $alias Service alias
@return object|null
Get a tagged service from its alias