Cleanest user compare function

ucmp.php

function ucmp($a, $b)
{
  $diff = $a - $b;
  return ($diff > 0) - ($diff < 0);
}
                                   
usort([7,8,-1], "ucmp");
                                   
function you_get_the_idea($a, $b)
{
  $diff = $a['price'] - $b['price'];
  return ($diff > 0) - ($diff < 0);
}