Simple example of PHP array operation
这篇文章主要介绍了PHP数组操作,结合简单实例形式分析了php数组转换、排序、移除等相关操作技巧,需要的朋友可以参考下
这个是一道简单的PHP数组入门题
$Str = "as5454654%^$%^$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
效果图
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
效果图
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。
效果图
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。
总结:以上就是本篇文的全部内容,希望能对大家的学习有所帮助。
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