Php 为在数组中对数组进行排序的函数设置排序方向
我有以下数组:Php 为在数组中对数组进行排序的函数设置排序方向,php,arrays,sorting,closures,Php,Arrays,Sorting,Closures,我有以下数组: $data = array( array("firstname" => "Mary", "lastname" => "Johnson", "age" => 25), array("firstname" => "Amanda", "lastname" => "Miller", "age" => 18), array("firstname" => "James", "lastname" => "Brown", "
$data = array(
array("firstname" => "Mary", "lastname" => "Johnson", "age" => 25),
array("firstname" => "Amanda", "lastname" => "Miller", "age" => 18),
array("firstname" => "James", "lastname" => "Brown", "age" => 31),
array("firstname" => "Patricia", "lastname" => "Williams", "age" => 7),
array("firstname" => "Michael", "lastname" => "Davis", "age" => 43),
array("firstname" => "Sarah", "lastname" => "Miller", "age" => 24),
array("firstname" => "Patrick", "lastname" => "Miller", "age" => 27)
);
以及以下排序功能:
function sortArray($data, $field)
{
if(!is_array($field)) $field = array($field);
usort($data, function($a, $b) use($field) {
$retval = 0;
foreach($field as $fieldname) {
if($retval == 0) $retval = strnatcmp($a[$fieldname],$b[$fieldname]);
}
return $retval;
});
return $data;
}
它工作得很好,但我想知道如何更改它以传递第三个参数,sort direction(ASC或DESC)
谢谢大家! 我认为您可以为排序函数创建一个包装器:
asc_sorter = function(a, b) {
return arraySorter(a, b);
}
desc_sorter = function(a, b) {
return -arraySorter(a, b);
}
然后调用asc_uuu或desc_uuu分拣机您可以根据方向参数反转阵列,如下所示:
function sortArray($data, $field, $direction)
/* sorting code */
if($direction == 'DESC')
return array_reverse($sorted_array);
else
return $sorted_array;
}
在代码中添加2个选项可以解决此问题:
function sortArray($data, $field, $dir = "asc")
{
//All your sorting code
//Then:
return strtolower($dir) == "asc" ? $data: array_reverse($data);
}
这将简单地反转数组,并在将任何内容传递给不是“asc”的第三个参数时以这种方式返回它。strtolower()允许您接受任何大小写(“asc”、“asc”、“asc”等),因此您不必记住,它默认为asc,这是您所期望的。您可以采用可选的布尔值进行降序排序,并将其默认为
false
。如果降序为真
,则只需将retval
乘以-1
:
function sortArray($data, $field, $descending = false)
{
if(!is_array($field)) $field = array($field);
usort($data, function($a, $b) use($field) {
$retval = 0;
foreach($field as $fieldname) {
if($retval == 0) $retval = strnatcmp($a[$fieldname],$b[$fieldname]);
}
return ($descending ? -1 : 1)*$retval;
});
return $data;
}
你试过了吗?它应该像在函数声明中添加第三个参数一样简单,然后添加一些代码来使用array_reverse或类似的方法。您是否尝试过此方法并遇到问题?你能告诉我你想做什么吗?