PHP简单选择排序算法实例，php算法实例
简单的选择排序算法：通过n-i次关键字间的比较，从n-i+1个记录中选出关键字最小的记录，并和第i（1
复制代码 代码如下:
class Sort{
/**
* 简单的选择排序
*
* @param unknown_type $arr
*/
public function selectSort(&$arr) {
$len=count($arr);
for ($i=0;$i
$min=$i;
for ($j=$i+1;$j
if ($arr[$min]>$arr[$j]) {//如果找到比$arr[$min]较小的值，则将该下标赋给$min
$min=$j;
}
}
if ($min!=$i){//若$min不等于$i，说明找到了最小值，则交换
$this->swap($arr[$i],$arr[$min]);
}
}
}
/**
* 将$a和$b两个值进行位置交换
*/
public function swap(&$a,&$b) {
$temp=$a;
$a=$b;
$b=$temp;
}
}
$arr=array(4,6,1,2,9,8,7,3,5);
$test=new Sort();
$test->selectSort($arr);//简单的选择排序
// var_dump($arr);
?>
简单选择排序的特点：交换移动数据次数相当少，从而节约了相应的时间
简单选择排序的时间复杂度分析：
无论最好最差的情况，其比较次数都是一样多，第i趟排序需要进行n-i次关键字的比较，此时需要比较n(n-1)/2次。所以最终的时间复杂度是O(n^2)
尽管与冒泡排序同为O(n^2)，但选择排序的性能还是略优于冒泡排序的。
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