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HomeBackend DevelopmentPHP TutorialSimple case analysis of PHP array operations

本文实例讲述了Simple case analysis of PHP array operations操作相关技巧。分享给大家供大家参考,具体如下:

这个是一道简单的Simple case analysis of PHP array operations入门题

$Str = "as5454654%^$%^$7675dhasjkdhh12u123123asdasd";
//将上面的统计上面字符串不同字符和出现的次数。

  

实现方式:将字符串转换成数组,在通过对数组的操作得到相应的结果。

$len = strlen($str);
//数组存在数组中
$array = array();
for($i=0;$i<$len;$i++)
{
  array_push($array,substr($str,$i,1));
}

   

根据上面的转换函数,我们得到的了,我们想要的结果。

接下来用三种方式来完成上面的。

//方法1
//对数组进行sort()排序
$arr = sort($array);
//去掉重复值
$arr1 = array_unique($array);
//打印数组$arr1你将发现,你继续来需要做的事了。注意键值直接的关系

   

Simple case analysis of PHP array operations

下面来看看方法二:

//无比风骚的方法二
$arr2 = array_count_values($array);
//打印数组$arr2 所有问题都解决了

Simple case analysis of PHP array operations

是不觉得方法二很坑爹呀~

注意:凡是可以用到PHP自动函数的,最好是用,理由我不说,你也应该懂

方法三:

我这里只说思想:运用ACM思想,对元素数组进行快排后,再对数组进行分块处理。

Simple case analysis of PHP array operations

看看这个函数给你上面提示:

array array_splice ( array $input , int $offset [, int $length< [, array $replacement ]] )
//把 input 数组中由 offset 和 length 指定的单元去掉,如果提供了 replacement 参数,
//则用 replacement 数组中的单元取代。返回一个包含有被移除单元的数组。注意 input 中的数字键名不被保留。

   

解决问题的方式很多,我现在就想到这三种,一个简单的问题,多想想。代码就会越敲越少。这就是进步。

希望本文所述对大家PHP程序设计有所帮助。

更多Simple case analysis of PHP array operations操作简单案例分析相关文章请关注PHP中文网!

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