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Comparison of running time of four basic sorting algorithms implemented in PHP (must read)
Comparison of running time of four basic sorting algorithms implemented in PHP (must read)
This article will introduce to you the running time comparison of four basic sorting algorithms implemented in PHP. It is very good and has reference value. Friends who are interested should take a look at it.
Many people say that algorithms are the core of the program. , the quality of the algorithm determines the quality of the program. As a junior PHPer, although I have little exposure to algorithmic things. However, you should still master the basic sorting algorithm. It is an essential tool for program development. This article will introduce to you the running time comparison of four basic sorting algorithms implemented in PHP. Let’s take a look.
No more nonsense, I will just post the code for you.
The specific code is as follows:
/**
* php四种基础排序算法的运行时间比较
* @authors Jesse (jesse152@163.com)
* @date 2016-08-11 07:12:14
*/
//冒泡排序法
function bubbleSort($array){
$temp = 0;
for($i = 0;$i < count($array) -1;$i++){
for($j = 0;$j < count($array) - 1 -$i;$j++){
if($array[$j] > $array[$j+1]){ //从小到大排列
$temp = $array[$j];
$array[$j] = $array[$j+1];
$array[$j+1] = $temp;
}
}
}
}
//选择排序法
function selectSort($array){
$temp = 0;
for($i = 0;$i < count($array) - 1;$i++){
$minVal = $array[$i]; //假设$i就是最小值
$minValIndex = $i;
for($j = $i+1;$j < count($array);$j++){
if($minVal > $array[$j]){ //从小到大排列
$minVal = $array[$j]; //找最小值
$minValIndex = $j;
}
}
$temp = $array[$i];
$array[$i] = $array[$minValIndex];
$array[$minValIndex] = $temp;
}
}
//插入排序法
function insertSort($array){ //从小到大排列
//先默认$array[0]，已经有序，是有序表
for($i = 1;$i < count($array);$i++){
$insertVal = $array[$i]; //$insertVal是准备插入的数
$insertIndex = $i - 1; //有序表中准备比较的数的下标
while($insertIndex >= 0 && $insertVal < $array[$insertIndex]){
$array[$insertIndex + 1] = $array[$insertIndex]; //将数组往后挪
$insertIndex--; //将下标往前挪，准备与前一个进行比较
}
if($insertIndex + 1 !== $i){
$array[$insertIndex + 1] = $insertVal;
}
}
}
//快速排序法
function quickSort($array){
if(!isset($array[1]))
return $array;
$mid = $array[0]; //获取一个用于分割的关键字，一般是首个元素
$leftArray = array();
$rightArray = array();
foreach($array as $v){
if($v > $mid)
$rightArray[] = $v; //把比$mid大的数放到一个数组里
if($v < $mid)
$leftArray[] = $v; //把比$mid小的数放到另一个数组里
}
$leftArray = quickSort($leftArray); //把比较小的数组再一次进行分割
$leftArray[] = $mid; //把分割的元素加到小的数组后面，不能忘了它哦
$rightArray = quickSort($rightArray); //把比较大的数组再一次进行分割
return array_merge($leftArray,$rightArray); //组合两个结果
}
$a = array_rand(range(1,3000), 1600); //生成1600个元素的随机数组
shuffle($a); //打乱数组的顺序
$t1 = microtime(true);
bubbleSort($a); //冒泡排序
$t2 = microtime(true);
echo "冒泡排序用时：".(($t2-$t1)*1000).'ms'."\n";
$t3 = microtime(true);
selectSort($a); //选择排序
$t4 = microtime(true);
echo "选择排序用时：".(($t4-$t3)*1000).'ms'."\n";
$t5 = microtime(true);
insertSort($a); //插入排序
$t6 = microtime(true);
echo "插入排序用时：".(($t6-$t5)*1000).'ms'."\n";
$t7 = microtime(true);
quickSort($a); //快速排序
$t8 = microtime(true);
echo "快速排序用时：".(($t8-$t7)*1000).'ms';Summary: The above is the entire content of this article, I hope it can be helpful to everyone’s learning help.
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