PHP5入門之分組演算法

例子，把一组数据拆分为6组输出算法。 代码：

$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 ;
 } // bbs.it-home.org

$strGroup = "";
for ($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;
}