How to determine how many characters there are in a string in php

Judgment method: 1. Use the "str_split($str)" statement to convert the string into a character array; 2. Use the "array_unique($arr)" statement to remove duplicate characters in the array; 3. Use " The count (duplication-removed array)" statement counts the length of the array after the duplication is removed, and you can obtain the number of different characters.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php determines how many characters there are in the string , which is to determine which different characters are in the string. Let me introduce to you the judgment method below.

Implementation method:

1. Use the str_split() function to convert the string into a character array

<?php   
$str = &#39;absd346d182831&#39;;
$arr=str_split($str);
var_dump($arr);
?>

2. Use the array_unique() function to remove repeated characters

$newarr=array_unique($arr);
var_dump($newarr);

will return a new array, the key value of which is the non-repeating characters in the string .

3. Use the count() function to count the length of the array after deduplication, and you can know the number of different characters in the string.

echo count($newarr);

Recommended learning: "PHP Video Tutorial"

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