数组按php中的键值排序

Array sorting by key value in php

我想根据数量在数组下面排序，但不知道如何排序。有人帮帮我

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Array(
[0] => Array
(
[id] => 1
[amount] => 20
)
[1] => Array
(
[id] => 2
[amount] => 30
)
[2] => Array
(
[id] => 3
[amount] => 10
)
)

相关讨论

之类的东西

php7 +

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usort($array, function($a, $b){
return $a['amount'] <=> $b['amount'];
});

什么是< = >("spaceship"operator)在PHP 7？

PHP＜7

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usort($array, function($a, $b){
if( $a['amount'] == $b['amount'] )
return 0;
else if($a['amount'] > $b['amount'])
return 1;
else
return -1
});

或你只是像其他人subtract……

usort[ 1 ]将做的工作采用自定义功能指标为对照，在amount性质和一个标准的比较performs为整数为大于/小于。黑与descending $b["amount"] - $a["amount"]如果你的愿望。

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$data = [
[
"id" => 1,
"amount" => 20
],
[
"id" => 2,
"amount" => 30,
],
[
"id" => 3,
"amount" => 10
]
];

usort($data, function ($a, $b) {
return $a["amount"] - $b["amount"];
});

print_r($data);

输出：

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Array
(
[0] => Array
(
[id] => 3
[amount] => 10
)

[1] => Array
(
[id] => 1
[amount] => 20
)

[2] => Array
(
[id] => 2
[amount] => 30
)

)

这里的复制与测试。

使用usort。

e.g

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function sortByAmount($x, $y) {
return $x['amount'] - $y['amount'];
}

usort($array, 'sortByAmount');
echo"[cc lang="php"]"; print_r($array);