php arrays - remove duplication and corresponding value
===

I have an 2d array that contains a 'title' and 'url' (both strings) as shown below. Is it possible to check for duplicates in the 'url' and if they exist, delete the corresponding 'title' too?  

  

    array
          0 => 
            array
              'title' => string 'China - Wikipedia, the free encyclopedia'
              'url' => string 'http://en.wikipedia.org/wiki/China'
          1 => 
            array
              'title' => string 'China'
              'url' => string 'http://www.state.gov/r/pa/ei/bgn/18902.htm'
          2 => 
            array
              'title' => string 'China | World news | The Guardian'
              'url' => string 'http://www.guardian.co.uk/world/china'
          3 => 
            array
              'title' => string 'China Travel Information and Travel Guide - Lonely Planet'
              'url' => string 'http://www.lonelyplanet.com/china'
          4 => 
            array
              'title' => string 'ChinaToday.com'
              'url' => string 'http://www.chinatoday.com/'