Split the string after each sixth character and add a "###" after each split in PHP

Description

The following code shows how to split the string after each sixth character and add a "###" after each split.

Example

/*from   w  w  w . ja v a2s .  c  o  m*/
<?php
    $str = "Hello world!";
    echo chunk_split($str,6,"###");
?>

The code above generates the following result.