排序数组 object 如果两个键的值数相等则匹配另一个键值对

Question

我想对 php object 数组进行排序，在排序时我必须考虑两个不同的键，如果两个用户的值相同，则考虑这些值的另一个键。

给定数组示例

[{'id':'1','total_number':'90','previous_number':'75'},
 {'id':'2','total_number':'80','previous_number':'91'},
 {'id':'3','total_number':'80','previous_number':'84'},
 {'id':'4','total_number':'80','previous_number':'96'},
 {'id':'5','total_number':'95','previous_number':'80'}
]

结果数组：

[{'id':'5','total_number':'95','previous_number':'80'}, 
 {'id':'1','total_number':'90','previous_number':'75'},
 {'id':'4','total_number':'80','previous_number':'96'},
 {'id':'2','total_number':'80','previous_number':'91'},
 {'id':'3','total_number':'80','previous_number':'84'} 
]

Answer 1

You can use a custom sort function to achieve the desired result with the help of usort function in PHP https://www.php.net/manual/en/function.usort.php

// custom sort function
function mySort($a, $b) {
  // is total_number same?
  if ($a->total_number === $b->total_number) {
    // use previous_number to sort
    if ($a->previous_number === $b->previous_number) {
      return 0;
    }
    // sort desc
    return $a->previous_number > $b->previous_number ? -1 : 1;
  }
  // sort desc
  return $a->total_number > $b->total_number ? -1 : 1;
}


// call the function
usort($array, 'mySort');