ranking.php

ranking.php

<?php
$arr = [
  ['dmid' => 12, 'num' => 1],
  ['dmid' => 13, 'num' => 12],
  ['dmid' => 14, 'num' => 12],
  ['dmid' => 15, 'num' => 6],
  ['dmid' => 16, 'num' => 8],
  ['dmid' => 17, 'num' => 8],
  ['dmid' => 18, 'num' => 0],
  ['dmid' => 19, 'num' => 0],
  ['dmid' => 20, 'num' => 0],
];

$arr = array_reduce($arr, function($pre, $cur){
  if (empty($pre[$cur['num']])) {
      $pre[$cur['num']] = [];
  }
  array_push($pre[$cur['num']], $cur);
  return $pre;
}, []);

krsort($arr);

$arr = array_values($arr);

$arr = array_map(function($item, $index){
    return array_map(function($sub) use($index) {
        return array_merge($sub, ['place' => $index + 1]);
    }, $item);
}, $arr, array_keys($arr));

$arr = array_reduce($arr, function($pre, $cur){
    $pre = array_merge($pre, $cur);
    return $pre;
}, []);

echo json_encode($arr);