php多维数组排序问题
我有一个复杂的多维数组。结构是这样的php多维数组排序问题,php,sorting,multidimensional-array,Php,Sorting,Multidimensional Array,我有一个复杂的多维数组。结构是这样的 Array ( [0] => Array ( [countries] => Array ( [0] => Array ( [country_code] => US
Array
(
[0] => Array
(
[countries] => Array
(
[0] => Array
(
[country_code] => US
[growth] => 3.57
)
[1] => Array
(
[country_code] => CA
[growth] => 4.77
)
[2] => Array
(
[country_code] => TT
[growth] => 0
)
)
[group_name] => North America
)
[1] => Array
(
[countries] => Array
(
[0] => Array
(
[country_code] => BR
[growth] => 2.19
)
[1] => Array
(
[country_code] => PE
[growth] => 1.78
)
[2] => Array
(
[country_code] => UY
[growth] => 8.83
)
[3] => Array
(
[country_code] => MX
[growth] => 3.83
)
)
[group_name] => South America
)
)
我想对它们进行排序(可以使用array\u multisort
),以便根据growth
(最高优先)对它们进行排序
这样,排序后的数组将
Array
(
[0] => Array
(
[countries] => Array
(
[0] => Array
(
[country_code] => CA
[growth] => 4.77
)
[1] => Array
(
[country_code] => US
[growth] => 3.57
)
[2] => Array
(
[country_code] => TT
[growth] => 0
)
)
[group_name] => North America
)
[1] => Array
(
[countries] => Array
(
[0] => Array
(
[country_code] => UY
[growth] => 8.83
)
[1] => Array
(
[country_code] => MX
[growth] => 3.83
)
[2] => Array
(
[country_code] => BR
[growth] => 2.19
)
[3] => Array
(
[country_code] => PE
[growth] => 1.78
)
)
[group_name] => South America
)
)
我是PHP新手,所以我不知道如何对这个复杂数组进行排序。我知道如何对siimple多维数组进行排序,如最坏情况下所示,您可以使用自己的排序功能。
它实际上是为这类事情而设计的
在您的情况下,您将通过
$arr[$i]['countries']
,并使用基于$arr['growth']
的比较函数排序我已经使用以下排序函数多年了:
/**
* sorting array of associative arrays - multiple row sorting using a closure
* see also: the-art-of-web.com/php/sortarray/
* @param array $data input-array
* @param string|array $fields array-keys
* @license Public Domain
* @return array
*/
function sortArray( $data, $field )
{
$field = (array) $field;
uasort( $data, function($a, $b) use($field) {
$retval = 0;
foreach( $field as $fieldname )
{
if( $retval == 0 ) $retval = strnatcmp( $a[$fieldname], $b[$fieldname] );
}
return $retval;
} );
return $data;
}
// example call, sort by 'growth' first and by 'country_code' afterwards
// this would be equal to a MySQL 'ORDER BY `growth` ASC, `country_code` ASC'
foreach( $countryArray as &$item )
{
$item['countries'] = sortArray( $item['countries'], array( 'growth', 'country_code' ) );
}
我想对一个复杂的数组进行排序,但我不知道怎么做。我已经阅读了手册,但无法获得一个如此复杂数组的好例子。