如何按给定键的值对关联数组进行排序并在php中维护键？ [复制]

Posted 2023-02-23

【中文标题】如何按给定键的值对关联数组进行排序并在php中维护键？ [复制]

【英文标题】：How to sort associative arrays by value of a given key and maintain key in php? [duplicate]

【发布时间】：2016-05-17 18:06:41

【问题描述】：

给定这个数组

$inventory = array(
    "sdfsdfsdsx65fsdf1"=>array("type"=>"fruit", "price"=>3.50),
    "sdfsdfsdsx65fsdf2"=>array("type"=>"milk", "price"=>2.90),
    "sdfsdfsdsx65fsdf3"=>array("type"=>"pork", "price"=>5.43)
);

我想要像下面这样的输出

$inventory = array(
    "sdfsdfsdsx65fsdf3"=>array("type"=>"pork", "price"=>5.43),
    "sdfsdfsdsx65fsdf1"=>array("type"=>"fruit", "price"=>3.50),
    "sdfsdfsdsx65fsdf2"=>array("type"=>"milk", "price"=>2.90)  
);

【参考方案1】：

$inventory = array(
  array("sdfsdfsdsx65fsdf1"=>array("type"=>"fruit", "price"=>3.50)),
  array("sdfsdfsdsx65fsdf2"=>array("type"=>"milk", "price"=>2.90)),
  array("sdfsdfsdsx65fsdf3"=>array("type"=>"pork", "price"=>5.43))
);

usort($inventory, function($a, $b) 
  foreach ($a as $a);
  foreach ($b as $b);
  if ($a['price'] == $b['price']) return 0;
  return ($a['price'] < $b['price']) ? 1 : -1;
);

print_r($inventory);

【讨论】：

你能给我 Array ( [sdfsdfsdsx65fsdf1] => Array ( [type] => fruit [price] => 3.5 ) [sdfsdfsdsx65fsdf2] => Array ( [type] => milk [价格] => 2.9 ) [sdfsdfsdsx65fsdf3] => 数组 ( [类型] => 猪肉 [价格] => 5.43 ) )

是的，你的输出是写的，但我已经编辑了问题，请检查一次，请给我一个输出