PHP:如何根据内部数组的值对包含内部数组的数组进行排序 - PHP: How to sort an array containing inner arrays based on one of it's inner array's values?

PHP: How to sort an array containing inner arrays based on one of it's inner array's values?

我有这样一个数组:

$animals = array(
    '0' => array('name' => 'cat', 'order' => '2'),
    '1' => array('name' => 'dog', 'order' => '1'),
    '2' => array('name' => 'fish', 'order' => '3')
);

我想把它变成这样:

$animals = array(
    '1' => array('name' => 'dog', 'order' => '1'),
    '0' => array('name' => 'cat', 'order' => '2'),
    '2' => array('name' => 'fish', 'order' => '3')
);

正如您所看到的，我希望基于order键进行排序。如何做到这一点?

使用PHP的本地ussort函数和用户定义的回调函数读取订单字段。

可以使用array_multisort()

 $animals = array(
    '0' => array('name' => 'cat', 'order' => '2'),
    '1' => array('name' => 'dog', 'order' => '1'),
    '2' => array('name' => 'fish', 'order' => '3')
);
$tmp = array();
foreach($animals as $k=>$r){
    $tmp[] = $r['order'];
}
array_multisort($tmp,SORT_ASC,$animals); // SORT_DESC to reverse
echo '<pre>',print_r($animals),'</pre>';

试试这个…使用的作用()

$animals = array(
'0' => array('name' => 'cat', 'order' => '2'),
'1' => array('name' => 'dog', 'order' => '1'),
'2' => array('name' => 'fish', 'order' => '3')
);

function build_sorter($key) {
   return function ($a, $b) use ($key) {
       return strnatcmp($a[$key], $b[$key]);
   };
}
usort($animals, build_sorter('order'));
var_dump($animals);