remove the last character from a string in php

1//Remove the last character using substr
2$string = substr($string, 0, -1);

1<?php
2echo substr('abcdef',0, -1);     // abcde
3?>

1echo substr('a,b,c,d,e,', 0, -1);
2# => 'a,b,c,d,e'
3

1phpCopy<?php
2$mystring = "This is a PHP program.";
3echo substr($mystring, 0, -1);
4?>
5

1phpCopy<?php
2$mystring = "This is a PHP program.";
3echo("This is the string before removal: $mystring\n");
4$newstring = rtrim($mystring, ". ");
5echo("This is the string after removal: $newstring");
6?>
7