在每个第6个字符后添加“ - ”，在字符串的末尾没有“ - ”

I have a 24-long string $string = "b46844869365d5c9138834b8", and I want to add "-" after every 6th character so I have b46844-869365-d5c913-8834b8.

I tried following solotions:

$string = implode("-", str_split($string,6));

$string = wordwrap($string, 6, '-', true);

$string = chunk_split($string, 6, '-');

but they all add a "-" at the end of the result so I get:

b46844-869365-d5c913-8834b8-

any suggestions?

Try this, its not adding - at last.

echo wordwrap('b46844869365d5c9138834b8' , 6 , '-' , true );

Output:

b46844-869365-d5c913-8834b8

Try this way:

<?php
$string = "b46844869365d5c9138834b8";
$s = str_split($string,6);
echo implode("-",$s);
?>