Home > Backend Development > PHP Tutorial > PHP:数组操作函数array_count_values()的实现

PHP:数组操作函数array_count_values()的实现

WBOY
Release: 2016-06-23 13:16:54
Original
1501 people have browsed it

    PHP作为一门弱类型的脚本语言,其变量无需声明,即用即得,其数组更是与其他强类型语言相差巨大,比如PHP数组中的关联键和数值键,其中最有趣的莫过于关联键了,这是在C++或JAVA中无法见到的,而且PHP还提供诸多强大的数组操作函数,比如

  array_values()//可以剥离数组中的关联键和数值键,或得有其元素的值所组成的数组

  array_keys()//获得所有的关联键和数值键

 利用这两个函数就可以非常方便简单的实现

 array_count_values()函数

 思路就是先用array_values()或得元素值数组

 再将元素值数组作为关联键新建一个数组(当然得先检查该关联键是否存在)

 然后再用foreach循环原来的数组将元素值作为新数组的关联键操作即可

 可能表达的不是很清楚,直接上代码

 

<?php//统计数组中数据出现的频率	function  mycount($arr)	{		if(is_array($arr))		{			$values = array_values($arr); //取得数组中数值						$count = array();//初始化数组									foreach ($values as $value)			{				if(!array_key_exists($value,$count))				{					//如果键不存在则创建关联键					$temp = array($value=>0);					//连接两个数组实际上相当于往里面添加元素					$count=array_merge($count,$temp);									}			}			foreach ($values as $key)			{				$count[$key]++;			}			return $count;		}		return  $arr;	}	$a = array("ABC","FUCKYOU","ABC","Dady","PO","Dady","LIN","ABC","LIN","FUCKYOU");	$a = mycount($a);	print_r($a);	?>
Copy after login

运行结果

Array (    [ABC] => 3    [FUCKYOU] => 2    [Dady] => 2    [PO] => 1    [LIN] => 2 )

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template