我正在尝试将每个Rates数组按Price从低到高（升序）排序。我无法理解其他解决方案。
*请注意，主阵列中有多个子阵列，如13188。
$array = array(
13188 => array(
'Rates' => array(
0 => array(
'RateName' => 'Standard Rate',
'Price' => 499.56
),
18739 => array(
'RateName' => 'Second Rate',
'Price' => 449.6
)
)
)
)
我希望得到这样的结果：
$array = array(
13188 => array(
'Rates' => array(
18739 => array(
'RateName' => 'Second Rate',
'Price' => 449.6
),
0 => array(
'RateName' => 'Standard Rate',
'Price' => 499.56
)
)
)
)
如您所见，Rates子阵列按Price排序。这意味着Price的{{1}}低于18739子阵列中Price的{{1}}。
答案 0 :(得分：0)
你可以在你的arr上为每个元素使用http://php.net/manual/en/function.uasort.php。该功能采用“回调”（http://php.net/manual/en/language.types.callable.php），您可以在其中描述您的行为准则。
<?php
$arr = [
13188 => [
'Rates' => [
0 => [
'RatteName' => 'Second Rate',
'Price' => 499.6
],
18739 => [
'RatteName' => 'Second Rate',
'Price' => 499.56
],
1 => [
'RatteName' => 'Second Rate',
'Price' => 15.5
],
2 => [
'RatteName' => 'Second Rate',
'Price' => 14
],
3 => [
'RatteName' => 'Second Rate',
'Price' => 100
]
]
],
13189 => [
'Rates' => [
0 => [
'RatteName' => 'Second Rate',
'Price' => 5
],
18739 => [
'RatteName' => 'Second Rate',
'Price' => 7
],
1 => [
'RatteName' => 'Second Rate',
'Price' => 18.3
],
2 => [
'RatteName' => 'Second Rate',
'Price' => 2
],
3 => [
'RatteName' => 'Second Rate',
'Price' => 22
]
]
],
13140 => [
'Rates' => [
0 => [
'RatteName' => 'Second Rate',
'Price' => 1
],
18739 => [
'RatteName' => 'Second Rate',
'Price' => 13
],
1 => [
'RatteName' => 'Second Rate',
'Price' => 866.17
],
2 => [
'RatteName' => 'Second Rate',
'Price' => 19
],
3 => [
'RatteName' => 'Second Rate',
'Price' => 25
]
]
],
];
foreach($arr as $key => &$arrRates){
$sortArr = $arrRates['Rates'];
uasort($sortArr, function($firstArr, $secondArr){
if ($firstArr['Price'] == $secondArr['Price']) {
return 0;
}
return ($firstArr['Price'] < $secondArr['Price']) ? -1 : 1;
});
$arrRates['Rates'] = $sortArr;
}
echo "<pre>";
print_r($arr);
echo "</pre>";
Array
(
[13188] => Array
(
[Rates] => Array
(
[2] => Array
(
[RatteName] => Second Rate
[Price] => 14
)
[1] => Array
(
[RatteName] => Second Rate
[Price] => 15.5
)
[3] => Array
(
[RatteName] => Second Rate
[Price] => 100
)
[18739] => Array
(
[RatteName] => Second Rate
[Price] => 499.56
)
[0] => Array
(
[RatteName] => Second Rate
[Price] => 499.6
)
)
)
[13189] => Array
(
[Rates] => Array
(
[2] => Array
(
[RatteName] => Second Rate
[Price] => 2
)
[0] => Array
(
[RatteName] => Second Rate
[Price] => 5
)
[18739] => Array
(
[RatteName] => Second Rate
[Price] => 7
)
[1] => Array
(
[RatteName] => Second Rate
[Price] => 18.3
)
[3] => Array
(
[RatteName] => Second Rate
[Price] => 22
)
)
)
[13140] => Array
(
[Rates] => Array
(
[0] => Array
(
[RatteName] => Second Rate
[Price] => 1
)
[18739] => Array
(
[RatteName] => Second Rate
[Price] => 13
)
[2] => Array
(
[RatteName] => Second Rate
[Price] => 19
)
[3] => Array
(
[RatteName] => Second Rate
[Price] => 25
)
[1] => Array
(
[RatteName] => Second Rate
[Price] => 866.17
)
)
)
)
答案 1 :(得分：0)
在保留密钥的同时，以升序顺序排序Rates子阵列有两种“样式”。这项工作的最佳工具是uasort()，因为它允许您对输入的阵列执行自定义排序。 a中的uasort()表示“保留原始密钥”。
“用户定义排序”的“魔力”在第二个参数 - 函数调用中。无论您决定拨打什么功能，uasort()都会将两个值的值传递给函数进行比较（我将这些值命名为$a和$b）。如何比较这两个变量（以及你比较它们的顺序）将决定排序的结果。
我将使用现代php“太空飞船运营商”进行比较，但您可以选择使用较旧/更详细的“大于，小于，等于”条件。
第一种方法“使用&符号”通过引用修改“（而不是在foreach循环中处理数组的副本，第二种方法通过引用必要的键简单地覆盖每次迭代的原始数组）
方法＃1 ：“按引用修改”
foreach($array as &$subarray){ // modify $subarray by reference using &
uasort($subarray['Rates'],function($a,$b){
return $a['Price']<=>$b['Price']; // $b<=>$a would mean DESC order
});
}
方法＃2 ：“迭代覆盖”
foreach($array as $key=>$subarray){ // iterate
$rates=$subarray['Rates']; // isolate the Rates subarray
uasort($rates,function($a,$b){ // sort the Rates subarray
return $a['Price']<=>$b['Price']; // ascending order
});
$array[$key]['Rates']=$rates; // overwrite the original array
}
为了澄清特定于这种情况的观点，您不应该使用array_multisort()，因为它会重新索引您的Rates子阵列（从零开始覆盖原始数字键）。对于你有关联键的情况 - 去吧......就在这个时候。
请勿将此方法用于您的案例：
foreach($array as &$subarray){ // modify $subarray by reference using &
array_multisort(array_column($subarray['Rates'],'Price'),$subarray['Rates']);
}
NOR THIS ONE：
foreach($array as $key=>$subarray){ // iterate and overwrite
$rates=$subarray['Rates'];
array_multisort(array_column($rates,'Price'),$rates);
$array[$key]['Rates']=$rates;
}
这是一个演示页面，它设置了所有四种方法，以便您可以运行它们并自己查看输出：Demo Link