how to remove last char from string

Question

It might be a simple task. But I am new to PHP.

I am creating a string of values getting from database for a specific purpose.

How to remove last char from s

Answer 1

Maybe

$str='';
$first = true;
foreach($dataarray as $value) {
     if(!$first) {
          $str .= "##";
     }
     else {
          $first = false;
     }
     $str .= $value;
 }