PHP array functions array_map, array_multisort multidimensional array sorting examples

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 positive or negative 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;
}

2. Use array_map and arra y_mutisort to sort array_mutisor can also perform secondary or triple sorting based on multiple values, which is incomparable to the previous function. Use array_map to get the array to be sorted by $arrField = array_map(create_function('$n', 'return $n["size"];'), $arrFile); //Use array_mutisort to sort $array_multisort($arrField, SORT_DESC, $arrFile);

3. Final test Test with an array of 188 data, sort 50 times and find the average. Way 1: 0.04269016 name 0.04267142 size

Method 2: 0.001249 name 0.00083924 size

>>> For more information, please view the complete list of php array sorting methods