Class Manager {
private $Id;
private $name;

public function __construct($name){
    $this->$name = $name;
}

//manager create a project
    public function createProject(){
        $project       = new Project('Web Dev','incomplete','2018/6/18');
        $this->project = $project;
    }

//manager can change project deadline
    public function updateProjectDeadline($projectDeadline){
        $this->project->SetProjectDeadline($projectDeadline);
    }

//manager can change project name
    public function setProjectName($projectName){
        $this->project->SetProjectDeadline($projectName);
    }

//manager can assign a employee To Project
    public function assignEmployeeToProject(Employee $employee){
        $this->employee = $employee;
        $this->project->SetProjectEmployee($this->employee);
    }

}

Class Project {
    private $Id;
    private $projectName
;
    private $projectStatus
;
    private $deadline
;
    private $employee;

    public function __construct($projectName
,$projectStatus
,$deadline
){
        $this->$projectName
 = $projectName
;
        $this->$projectStatus
 = $projectStatus
;
        $this->$deadline
 = $deadline
;
    }

    public function SetProjectDeadline($deadline
)
{
        $this->$deadline
 = $deadline
;
    }
    public function SetProjectEmployee(Employee $employee)
{
        $this->$employee = $employee;
    }
    public function setProjectStatus($projectStatus
)
{
        $this->$projectStatus
 = $projectStatus
;
    }
    public function setProjectName($projectName
)
{
        $this->$projectName
 = $projectName
;
    }
}

Class Employee {
    private $empName;

    public function __construct($empName){
        $this->$empName = $empName;
    }

    //employee can submit project
    public function submitProject(Project $project){
        $this->project = $project;
        $this->project->setProjectStatus('submit');
    }
}