php array_map array_multisort 高效处理多维数组排序
对多维数组排序,通用的作法是
1 获取利用排序的数据并且将其放入数组$arrSort. 其中键索引为要排序数组的索引,保证唯一性
2 利用排序函数sort等对$arrSort进行排序.
3 遍历$arrSort,根据其索引,获取多维数组的数据,重新构造排序后的多维数组.
<div class="codetitle"><a style="CURSOR: pointer" data="66823" class="copybut" id="copybut66823" onclick="doCopy('code66823')"> 代码如下:
<div class="codebody" id="code66823">
Array
(
[0] => Array
(
[link] => test
[name] => test.rpm
[type] => file
[size] => 988.9k
[mtime] => 1185160178)
....
)
I 很久以前在网上找到的
一个排序
函数,谈不上高效,但很实用
<div class="codetitle">
<a style="CURSOR: pointer" data="58538" class="copybut" id="copybut58538" onclick="doCopy('code58538')"> 代码如下: <div class="codebody" id="code58538">
_array_sort($arrFile,1,1);//根据name字段排序
_array_sort($arrFile,3,1);//根据size字段排序
/
@records 要排序的数组
@field要排序的字段,注意是数字
@reverse正序还是反序
/
function _array_sort($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;
}
所不能比的.
