为什么要在php中使用str_split（）？

Question

Given the following code :

$str = 'CLAX';
echo $str[2];  //prints 'A'

then why should I use str_split( $str ) to convert string to a array of characters ?

I understand str_split( $str , 2 ) will return array of strings; each string being 2 characters long.

http://php.net/manual/en/function.str-split.php

Answer 1

This function is to split a string into an array with given string split length

By default string split length is set 1

If you want to split a string into given in given length, then you can use str_split. But in your case you are splitting string with default length 1 that is by you are getting confused.

<?php

$str = "CLAX";
echo $str[2]; //here you are referring to 2 index of string

$arr2 = str_split($str);
Array
(
    [0] => C
    [1] => L
    [2] => A
    [3] => X
)
echo $str[2]; //here you are referring to 2 index of an array

str_split reference

<?php

$str = "Hello Friend";
$arr2 = str_split($str, 3);
Array
(
    [0] => Hel
    [1] => lo
    [2] => Fri
    [3] => end
)