PHP Array values and concatenation problem

I have a short title and message that I want to show, defining the following:

class A {
  public $name = 'Mark';
  public $entry = array(
    'title'   => 'Some title',
    'message' => 'Hi '.$name
  );

  // Constructor
  public function __construct() {}

  // Some other functions
}

This isn't working.

Can someone explain why? Should I go for separate variables instead or is there a better way? Thanks for your time.

EDIT

You are trying to pull that off in property declaration of a Class, aren't you? Property declarations happen during COMPILE-TIME and can only accept values, not operations that require RUN-TIME to happen and concatenation definitely is a run-time operation... Put that line into your constructor method instead.

class A
{
    public $name = 'Mark';
    public $entry = array("test");
    public $var1 = someFunct();    // WRONG, ITS AN OPERATION and REQUIRES RUNTIME
    public $var2 = 1 + 2; // WRONG, ITS AN OPERATION and REQUIRES RUNTIME
    public $var3 = CLASS_NAME::SOME_CONSTANT_OR_PROPERTY_HERE; // WORKS, CONSTANTS ARE DETECTED IN COMPILE-TIME
    public $var4 = $anythingWithDollarSign; // WRONG, SYNTAX ERROR, REQUIRES RUNTIME

    public function __construct() {
        $this->entry = array( 'title' => 'Some title', 'message' => 'Hi ' . $this->name );
    }
}

in classes, you can only declare variables that consist of a static value, and not a dynamic value such as "name" . $name.

What you would have to do is concat in the constructor, (That's why its there):

class A
{
    public $name = 'Mark';

    public $entry = array(
        'title'   => 'Some title',
        'message' => 'Hi %s'
    );

    // Constructor
    public function __construct()
    {
        $this->entry["message"] = sprintf($this->entry["message"],$this->name);
    }
}