PHP unique array by value?

I have an array in PHP that looks like this:

  [0]=>
       array(2) {
           ["name"]=>
              string(9) "My_item"
           ["url"]=>
              string(24) "http://www.my-url.com/"
       }
  [1]=>
     array(2) {
         ["name"]=>
             string(9) "My_item"
         ["url"]=>
            string(24) "http://www.my-url2.com/"
     }

The two values in "name" are the same in this two items. I want to sort out duplicates like this.

How do I create an unique array by checking the "name" value?