PHP Array交叉表实现代码

答案：
如果使用sql语句做的话 工作量太大了，于是尝试自己写一个交叉表的类，好二话不说，我们看看代码 
复制代码 代码如下:
 
/** 
* 基本交叉表 
* @author hugh 
* 
*/ 
class Pivot 
{ 
private $HORIZONTAL_TOTAL_FIELD = 'total'; 
private $VERTICAL_TOTAL_FIELD = 'total'; 
private $data; 
private $topPivot; 
private $leftPivot; 
private $measure; 
private $horizontalColumn = array (); 
private $verticalColumn = array (); 
private $pivotValue = array (); 
private $isHorizontalTotal = true; 
private $isVerticalTotal = true; 
private $horizontalTotal = null; 
private $verticalTotal = null; 
private $title = 'PivotTab'; 
/** 
* 初始化交叉表 
*/ 
private function InitPivot() 
{ 
$this->topPivot; 
foreach ( $this->data as $d ) 
{ 
$this->horizontalColumn [] = $d [$this->leftPivot]; 
$this->verticalColumn [] = $d [$this->topPivot]; 
} 
$this->horizontalColumn = array_unique ( $this->horizontalColumn ); 
$this->verticalColumn = array_unique ( $this->verticalColumn ); 
$reasult = array (); 
foreach ( $this->horizontalColumn as $h ) 
{ 
foreach ( $this->verticalColumn as $v ) 
{ 
$this->pivotValue [$h] [$v] = 0; 
} 
} 
} 
/** 
* 填充数据 
*/ 
private function fillData() 
{ 
foreach ( $this->data as $row ) 
{ 
$this->pivotValue [$row [$this->leftPivot]] [$row [$this->topPivot]] += $row [$this->measure]; 
} 
if ($this->isHorizontalTotal) 
{ 
$this->setHorizontalTotal (); 
} 
if ($this->isVerticalTotal) 
{ 
$this->setVerticalTotal (); 
} 
} 
/** 
* 设置纵向合计 
*/ 
private function setVerticalTotal() 
{ 
$this->verticalColumn [] = $this->VERTICAL_TOTAL_FIELD; 
foreach ( $this->horizontalColumn as $i ) 
{ 
$rowsum = 0; 
foreach ( $this->verticalColumn as $j ) 
{ 
$rowsum += $this->pivotValue [$i] [$j]; 
} 
$this->pivotValue [$i] [$this->TOTAL_FIELD] = $rowsum; 
} 
} 
/** 
* 设置横向合计 
*/ 
private function setHorizontalTotal() 
{ 
$this->horizontalColumn [] = $this->HORIZONTAL_TOTAL_FIELD; 
foreach ( $this->verticalColumn as $i ) 
{ 
$rowsum = 0; 
foreach ( $this->horizontalColumn as $j ) 
{ 
$rowsum += $this->pivotValue [$j] [$i]; 
} 
$this->pivotValue [$this->HORIZONTAL_TOTAL_FIELD] [$i] = $rowsum; 
} 
} 
/** 
* 渲染 
*/ 
function Render() 
{ 
echo '<pre>'; 
print_r ( $this->pivotValue ); 
} 
/** 
* 渲染为table 
*/ 
function RenderToTable() 
{ 
$resault = "<table border='1' width='250'>\n"; 
$resault .= "<tr><td>$this->title</td>\n"; 
foreach ( $this->verticalColumn as $value ) 
{ 
$resault .= "<td>$value</td>\n"; 
} 
$resault .= "</tr>\n"; 
foreach ( $this->horizontalColumn as $i ) 
{ 
$resault .= "<tr><td>$i</td>\n"; 
foreach ( $this->pivotValue [$i] as $value ) 
{ 
$resault .= "<td>$value</td>\n"; 
} 
$resault .= "</tr>\n"; 
} 
$resault .= "</table>"; 
return $resault; 
} 
/** 
* 构造交叉表 
* @param $data 数据源 
* @param $topPivot 头栏目字段 
* @param $leftPivot 左栏目字段 
* @param $measure 计算量 
*/ 
function __construct(array $data, $topPivot, $leftPivot, $measure) 
{ 
$this->data = $data; 
$this->leftPivot = $leftPivot; 
$this->topPivot = $topPivot; 
$this->measure = $measure; 
$this->horizontalColumn = array (); 
$this->verticalColumn = array (); 
$this->InitPivot (); 
$this->fillData (); 
} 
} 
 
重点在于InitPivot方法及fillData方法。 
InitPivot里面保证了所有的item都会有值（默认为0） 
fillData方法使用选择填充添加的方法，将数据填充入我们装数据的$pivotValue里面。 

然后喜欢怎么输出都可以了

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