How do I remove all specific characters at the end of a string in PHP?

How do I remove the last character only if it's a period?

$string = "something here.";
$output = 'something here';

$output = rtrim($string, '.');

(Reference: rtrim on PHP.net)

using rtrim replaces all "." at the end, not just the last character

$string = "something here..";
echo preg_replace("/\.$/","",$string);

To remove the last character only if it's a period and not resorting to preg_replace we can just treat the string as an array of char and remove the final character if it is a dot.

if ($str[strlen($str)-1]==='.')
  $str=substr($str, 0, -1);

I know the question is solved. But maybe this answer will be helpful for someone.

rtrim() - Strip whitespace (or other characters) from the end of a string

ltrim() - Strip whitespace (or other characters) from the beginning of a string

trim() - Strip whitespace (or other characters) from the beginning and end of a string

For removing special characters from the end of the string or Is the string contains dynamic special characters at the end, we can do by regex.

preg_replace - Perform a regular expression search and replace

$regex = "/\.$/";             //to replace the single dot at the end
$regex = "/\.+$/";            //to replace multiple dots at the end
$regex = "/[.*?!@#$&-_ ]+$/"; //to replace all special characters (.*?!@#$&-_) from the end

$result = preg_replace($regex, "", $string);

Here is some example to understand when $regex = "/[.*?!@#$&-_ ]+$/"; is applied to string

$string = "Some text........"; // $resul -> "Some text";
$string = "Some text.????";    // $resul -> "Some text";
$string = "Some text!!!";      // $resul -> "Some text";
$string = "Some text..!???";   // $resul -> "Some text";

I hope it is helpful for you.

Thanks :-)