Split array into unique pairs

Question

Say i start with a simple array (which could be theoretically of any length):

$ids  = array(1,2,3,4);

What it the best solution for splitti

Answer 1

$ids  = array(1,2,3,4);
$result=array();
foreach($ids as $value_1)
{
  foreach($ids as $value_2)
  {
     if($value_1 !=$value_2)
     {
       $result[]=array($value_1,$value_2);
     }
   }
}
echo "
";
print_r($result);