如何在php中按给定键的值对关联数组排序并维护键？

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)
);

我想输出如下

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

$inventory=array(
数组（“SDFSDFSDX65FSDF1”=>数组（“类型”=>“水果”、“价格”=>3.50”），
数组（“SDFSDFSDX65FSDF2”=>数组（“类型”=>“牛奶”，“价格”=>2.90）），
数组（“SDFSDFSDX65FSDF3”=>数组（“类型”=>“猪肉”，“价格”=>5.43））
);
usort（$库存，功能（$a，$b）{
foreach（$a作为$a）；
foreach（$b作为$b）；
如果（$a['price']=$b['price']）返回0；
回报（$a['price']<$b['price']）？1:-1；
});
打印（库存）；

你能给我数组（[sdfsdfsdsx65fsdf1]=>Array（[type]=>fruit[price]=>3.5）[sdfsdfsdsx65fsdf2]=>Array（[type]=>milk[price]=>2.9）[sdfsdfsdsx65fsdf3]=>Array（[type]=>pork[price]=>5.43）是的，您的输出是书面的，但我已经编辑了问题，请检查一次，然后给我一个输出

$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);