将参数传递给sort函数

Question

I am using a uasort function like this:

uasort($entity_list, 'sortArray');

function sortArray($a, $b) {
  if($a['fixed_column_name'] == $b['fixed_column_name']) {
      return 0;
  }

  return ($a['fixed_column_name'] < $b['fixed_column_name']) ? -1 : 1;
}

I would like to pass a parameter to the sortArray function, like this:

uasort($entity_list, 'sortArray($arg)');

function sortArray($a, $b, $arg) {

  $larg = $arg;

  if($a[$larg] == $b[$larg]) {
      return 0;
  }

  return ($a[$larg] < $b[$larg]) ? -1 : 1;
}

Answer 1

If you're using PHP 5.3+ (and you really should at this point in time), you can use closures:

uasort($entity_list, function ($a, $b) use ($arg) {
    if ($a[$arg] == $b[$arg]) {
        return 0;
    }
    return ($a[$arg] < $b[$arg]) ? -1 : 1;
});

Otherwise, you'll have to work around doing the same thing using global variables (oh noes!) or a class.