Create class object as data member in another class in PHP

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PHP

Hi All,
I have to create one class object as data member in another class. How to achieve that in PHP.
eg

class TableModel {	
	
    public $totalRecords;
	public $pageNumber;
    // More members & functions. 
} 

class SearchModel {	
     public $id;
     // More members & functions. 
     // Want to create object of TableModel class here....
}

What I have tried:

I tried several ways like

public $tableoptions = TableModel();
public $tableoptions = new TableModel;
$tableoptions = new TableModel();

& many more ways.