php array_map array_multisort efficiently handles multi-dimensional array sorting

To sort multi-dimensional arrays, the common method is
1 Obtain the sorted data and put it into the array $arrSort. The key index is the index of the array to be sorted to ensure uniqueness
2 Use the sorting function sort to perform $arrSort Sorting.
3 Traverse $arrSort, obtain the data of the multi-dimensional array according to its index, and reconstruct the sorted multi-dimensional array.

The code is as follows:
Array
(
[0] => Array
(
[link] = > test
[name] => test.rpm
[type] => file
[size] => 988.9k
[mtime] => 1185160178)
....
)

I A long time A sorting function I found on the Internet before is not efficient, but it is very practical. The code is as follows:

_array_sort($arrFile, 1, 1); // Sort according to the name field

_array_sort($arrFile, 3, 1); //Sort according to the size field
/*
@records Array to be sorted
@field Field to be sorted, pay attention to whether it is a number
@reverse forward or reverse order
*/
function _array_sort($records, $field, $reverse , $defaultSortField = 0)
{
$uniqueSortId = 0;
$hash = array();
$sortedRecords = array();
$tempArr = array();
$indexedArray = array();
$recordArray = array();

foreach($records as $record)

{

$uniqueSortId++;
$recordStr = implode("|", $record)."|".$uniqueSortId;
$recordArray[] = explode(" |", $recordStr);
}

$primarySortIndex = count($record);

$records = $recordArray;

foreach($records as $record)

{

$hash[$record[$primarySortIndex]] = $record[$field];
}
uasort($hash, "strnatcasecmp");
if($reverse)
$hash = array_reverse($hash, true);

$valueCount = array_count_values($hash);

foreach($hash as $primaryKey => $value)

{

$indexedArray[] = $primaryKey;
}

$i = 0;

foreach($hash as $primaryKey => $value)

{
$i++;
if($valueCount[$value] > 1)
{
foreach($records as $record)
{
if($primaryKey == $record[$primarySortIndex])
{
$tempArr [$record[$defaultSortField]."__".$i] = $record;
break;
}
}

$index = array_search($primaryKey, $indexedArray);

if(($i == count ($records)) || ($value != $hash[$indexedArray[$index+1]]))

{

uksort($tempArr, "strnatcasecmp");

if($reverse)

$tempArr = array_reverse($tempArr);

foreach($tempArr as $newRecs)

{

$sortedRecords [] = $newRecs;
}

$tempArr = array();

}

}
else
{
foreach($ records as $record)
{
if($primaryKey == $record[$primarySortIndex])
{
$sortedRecords[] = $record;
break;
}
}
}
}
return $sortedRecords;
}

II Use array_map and array_mutisor to sort

array_mutisor can also perform secondary or tertiary sorting based on multiple values, which is incomparable to the previous function.

The code is as follows:

Use array_map to get the array to be sorted

$arrField = array_map(create_function('$n', 'return $n["size"];'), $arrFile);
//Use array_mutisor to sort
$array_multisort($arrField, SORT_DESC, $arrFile);

III Final test

Test with an array of 188 data, sort 50 times to find the average.

The first way
0.04269016 name
0.04267142 size
The second way
0.001249 name
0.00083924 size

Thank you your reading , if you want to get more related content, please pay attention to the PHP Chinese website (www.php.cn)!