php关联数组排序(快速排序)
起因
好吧,我承认最近我跟快速排序干上了,各种测试编写快速排序程序,现在就用php实现快速排序,跟之前文章不同,这次php的快排是能解决实际需要的。
使用环境和条件
有这样一种情况,php里面的关联数组,如果下面这样的数组数据:
$array = array ( array ( 'name' => "xiao", 'age' => 3 ), array ( 'name' => 'wang', 'age' => 1 ), array ( 'name' => 'chen', 'age' => 2 ) );
我们要对数组针对age字段进行排序,php自带的函数,无论是那种sort,显然都不能满足我们的需求,因此我们可以自己写一个快速排序代码,很快的实现我们的要求
注意情况
php里面是没有指针存在的,所以当想要引用传递的时候,我们不能跟C代码一样,直接这样写quicksort(int *A, int begin, int end),而是要使用php的&运算符,将数组的地址传递跟快速排序函数,这样就能在php里实现引用传递而不是值传递
快速排序代码
QuickSortProcess ( $array, 0, count ( $array ) - 1 ); print_r ( $array ); /** * Description:快速排序中获取中枢点的位置 */ function QuickPartition(&$array, $left, $right) { // 1.基准定义 $stand = $array [$left]; // 2.从区间两端向中间扫描,直到$left == $right为止 while ( $left = $stand ['age'] ) { $right --; } if ($left <br> 我在项目上就用到了这个快速排序,挺开心的,不枉这个10月1假期花了N天AC快速排序的c代码
- 1楼dickeylth昨天 14:30
- 这种问题可以查阅下php中的usort,写自定义的排序回调函数就行了。参见:http://www.php.net/manual/zh/function.usort.php
- Re: zinss26914昨天 15:27
- 回复dickeylthn查了一下您给的链接,确实是这样,可以省不少代码量,多谢多谢,哈哈,其实也想在实际项目里用下自己写的排序算法,总是调用php的自带函数,感觉自己都快不会写程序了

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