php FOR 循环优化有关问题
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2024-01-21 14:00:46
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php FOR 循环优化问题
上次发个帖子没人跟,可能是问题不具体或者php基础编程人少或者太忙.............
我想从1-33选出6个不重复的号,然后写入数据库
现在选号过程PHP处理的很慢还总出错误,谁有兴趣帮我把下面的代码优化下:
------解决方案--------------------
上次发个帖子没人跟,可能是问题不具体或者php基础编程人少或者太忙.............
我想从1-33选出6个不重复的号,然后写入数据库
现在选号过程PHP处理的很慢还总出错误,谁有兴趣帮我把下面的代码优化下:
- PHP code
";//显示效果,本想写入TXT文档在传如数据库. } } } } }}?>
------解决方案--------------------
- PHP code
$a = range(1, 33);$ar = combination($a, 6);//求组合高效率的10移动法function combination($numArr,$combineLen) { $numCt = count($numArr); if($combineLen > $numCt) return; $bin = str_pad('',$combineLen,'1'); $bin = str_pad($bin,$numCt,'0',STR_PAD_RIGHT); $find = $bin; $rs[] = implode(' ',array_slice($numArr,0,$combineLen)); $j = 1; while(strrev($find) != $bin) { $k = explode('10',$find,2); $find = $find{0} === '0' ? strrev($k[0]).'01'.$k[1] : $k[0].'01'.$k[1]; for($i=0;$i------解决方案--------------------
- PHP code
[User:root Time:21:21:46 Path:/home/liangdong/php]$ php permutation.php Total time used : 9738642ms[User:root Time:21:21:56 Path:/home/liangdong/php]$ cat permutation.php = $total; ++ $ndx) { $temp[$num] = $table[$ndx]; _get_permutations($ndx + 1, $num + 1); }}function get_permutations($n = 6) { global $total; global $perms; global $fp; if ($n 33) { return false; } $total = $n; $fp = fopen("data.txt", "w"); _get_permutations(0, 0); fclose($fp); return true;}get_permutations();$end_time = microtime(true);$end_time *= 1000 * 1000;echo "Total time used : " . ($end_time - $beg_time) . "ms" . PHP_EOL;?>相关文章
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