1. Array
2. (
3.     [0] => Array
4.         (
5.             [Price] => 110.00
6.         )
7. [1] => Array
8.         (
9.             [Price] => 110.00
10.         )
11. [2] => Array
12.         (
13.             [Price] => 113.00
14.         )
15. )

1. Array
2. (
3. [0] => Array
4. (
5.  [Price] => 110.00
6.  [Name] => Blop
7. )
8. [1] => Array
9. (
10.  [Price] => 110.00
11.  [Name] => Gus
12. )
13. [2] => Array
14. (
15.  [Price] => 113.00
16.  [Name] => Blup
17. )
18. )

$a = array(
            array('Price' => 110.00,'Name' => 'Blop'),
            array('Price' => 113.00,'Name' => 'Blup'),
            array('Price' => 110.00,'Name' => 'Blip')
        );
 
$b = array_filter($a,'dedoublonne');
 
function dedoublonne($item)
{
    static $prices = array();
    
    if(!isset($prices[$item['Price']]))
    {
        $prices[$item['Price']] = $item['Price'];
        return true;
    }
    return false;
}
 
/*
Retourne :
Array
(
    [0] => Array
        (
            [Price] => 110
            [Name] => Blop
        )
 
    [1] => Array
        (
            [Price] => 113
            [Name] => Blup
        )
)
 
 
*/

$prices = array();
$nb_elements = count($a);
for($i=0;$i<$nb_elements;$i++)
{
    if(!isset($prices[$a[$i]['Price']]))
    {
        $prices[$a[$i]['Price']] = $a[$i]['Price'];
    }
    else
    {
        unset($a[$i]);
    }
}