PHP5入门之分组算法

例子，把一组数据拆分为6组输出算法。 代码：

2. $groupCount = 6; //组数
3. $userIdList = array(1, 2, 3, 4, 5, 6, 7, 8, 9,10);
4. $size = count($userIdList );
5. $sizeGroupPer = floor($size / $groupCount );//每组被分配的个数
6. $criticalValue = $size % $groupCount ; //临界值
7. $startIndex = 0;
8. $endIndex = 0;
9. for ($i = 0; $i < $groupCount ; $i++ ) {
10. if ($i < $critical) { //表示哪些组可以被多分配
11. $endIndex = $startIndex + $sizeGroupPer + 1;
12. } else {
13. $endIndex = $startIndex + $sizeGroupPer ;
14. } // bbs.it-home.org
16. $strGroup = "";
17. for ($j = $startIndex ; $j < $endIndex; $j++) {
18. if (($j + 1) == $to) {
19. $strGroup .= $arryData[$j];
20. } else {
21. $strGroup .= $arryData[$j].",";
22. }
23. }
24. $startIndex = $endIndex;
25. echo "第 ".$i." 组数据：：".$strGroup;
26. }