Three ways to get the number of occurrences of characters in a string in php

This article mainly introduces the method for PHP to obtain the number of occurrences of each character in a string. It analyzes three common techniques for PHP to obtain the number of occurrences of characters in a string. It has certain reference value. Friends who need it can refer to it.

The example in this article describes how PHP obtains the number of occurrences of each character in a string.

The specific implementation method is as follows:

<?php
//获取字符串是哪一个字符出现的字数最多
$str = "sdfhletlsflahlajgfd;lsje;r;wj;ralajfe149253573";
//方法一
$arr = str_split($str);
//字符串分隔到数组中
$arr = array_count_values($arr);
//用于统计数组中所有值出现的次数，返回一个数组
//键名为原数组的键值，键值为出数
arsort($arr);//按键值倒序
echo "<pre class="brush:php;toolbar:false">";
print_r($arr);
//方法二
$arr = str_split($str);
$con = array();
foreach ($arr as $v){
 if(!@$con[$v]){
 $con[$v]=1;
 }else{
 $con[$v]++;
 }
}
arsort($con);
print_r($con);
//方法三
$arr = str_split($str);
$unique = array_unique($arr);
//移除数组中重复的值，并返回结果数组(键名不变);
print_r($unique);
foreach($unique as $v){
 $arr2[$v] = substr_count($str,$v);
 //substr_count():计算某字符在字符串中出现的次数
}
arsort($arr2);
print_r($arr2);
?>

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