PHP 5 入门 分组算法（一）

把一组数据拆分为6组输出算法

 

$groupCount = 6; //组数

$userIdList = array(1, 2, 3, 4, 5, 6, 7, 8, 9,10);

$size = count($userIdList );

$sizeGroupPer = floor($size / $groupCount );//每组被分配的个数

$criticalValue = $size % $groupCount ; //临界值
$startIndex = 0;
$endIndex = 0;
for ($i = 0; $i < $groupCount ; $i++ ) { 

 

            if ($i < $critical) { //表示哪些组可以被多分配

               $endIndex = $startIndex + $sizeGroupPer + 1;

            } else {

                $endIndex = $startIndex + $sizeGroupPer ;

            }

  
            $strGroup = ""; 

            for ($j = $startIndex ; $j < $endIndex; $j++) {
               if (($j + 1) == $to) {
                   $strGroup .= $arryData[$j];
               } else {
                   $strGroup .= $arryData[$j].",";            
               }
            }

 

           $startIndex = $endIndex;

         echo "第 ".$i." 组数据：：".$strGroup; 

}