PHP冒泡法排序与二分法查找实例
冒泡法排序与二分法查找排序算法是我们在初中时就学过的,下面我来介绍在PHP冒泡法排序与二分法查 找实例,各位同学不防进入参考.
冒泡法排序,随便给出一个乱序数组
$arr = array(0,2,10,9,19,23,89,112,321,234);
统计数组:$num = count($arr);
冒泡倒序排列:
<?php for ($i = 0; $i < $num - 1; $i++) { for ($m = 0; $m < $num - 1; $m++) { if ($arr[$m] < $arr[$m + 1]) { $temp = $arr[$m]; $arr[$m] = $arr[$m + 1]; $arr[$m + 1] = $temp; } // echo $arr[$m].'<br>'; } } //输出排序后的结果 var_dump($arr); //冒泡顺序排列 for ($x = 0; $x < $num - 1; $x++) { for ($y = 0; $y < $num - 1; $y++) { if ($arr[$y] > $arr[$y + 1]) { $temp = $arr[$y]; $arr[$y] = $arr[$y + 1]; $arr[$y + 1] = $temp; } } } //输出排序后的结果 var_dump($arr); //二分法查找 function dichotomy($array, $k, $low = 0, $high = 0) { if (count($array) != 0 && $high == 0) { $high = count($array); } if ($low <= $high) { $mid = intval(($low + $high) / 2); if ($array[$mid] == $k) { return $mid; } elseif ($k < $array[$mid]) { return dichotomy($array, $k, $low = 0, $mid - 1); } else { return dichotomy($array, $k, $mid + 1, $high); } } else { return false; } } //输出查找结果 echo dichotomy($arr, 23); ?>
今天简单的研究了一下最常用的冒泡法排序与二分法查找,写了一个简单的案例,加强自己对php的学习,也希望对今后php学习者能提供一点点的帮助。
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