PHP usort pass parameter with namespace-CodePudding

namespace App\Controllers\Redis;

class getArray{
  public function sortArray(){
   $sortMe = Array
   (
    '05' => 100,
    '15' => 1,
    '24' => 10,
    '32' => 1000,
   );

   $sorted= Array
   (
    '0' => 1,
    '1' => 10,
    '2' => 100,
    '3' => 1000,
   );
   function cmp($a, $b) {
    //I need to get $sorted here
    return array_search($a, $sorted) - array_search($b, $sorted);
  }
  usort($sortMe , 'App\Controllers\Redis\cmp');//pass the $sorted parameter
}
}

How can I pass the array parameter with namespace as all others reference I found are without namespace so I am lost. Appreciate any advice.

what I tried:

private $sorted = []; //declace a private var in the class

$this->sorted= Array
(
    '0' => 1,
    '1' => 10,
    '2' => 100,
    '3' => 1000,
);

function cmp($a, $b) {
  $sorted = $this->sorted;
  return array_search($a, $sorted) - array_search($b, $sorted);
}

but this will return PHP error : PHP Fatal error: Uncaught Error: Using $this when not in object context

PHP editor Link:

The expected result : https://3v4l.org/gbbua#v7.0.14

My current program : https://3v4l.org/1Kmoq#v7.0.14

CodePudding user response：

Namespaces or classes have very little to do with anything here. You just want an anonymous callback:

$sortMe = array(...);
$sorted = array(...);

usort($sortMe , function ($a, $b) use ($sorted) {
    return array_search($a, $sorted) - array_search($b, $sorted);
});