Remove repeated character at the end of string in PHP

I have a string that is being dynamically created. As a result, sometimes the end of the string might have one dash or sometimes it might have more. I don’t know how many dashes will be at the end; however, no matter how many dashes are at the end, I need to drop them all. So a few examples:

This:
101-239204-9230—
Becomes:
101-239204-9230

This:
101-239204-9230-
Becomes:
101-239204-9230

So no matter how many dashes at the end, if there are dashes at the end, I need to drop them all. I just can’t wrap my head around how to do this exactly.

I’ve tried using str_replace, which works if I know the exact number of dashes, so:

$number = 101-239204-9230---
$fixedNumber = str_replace('---', '', $number);
echo $fixedNumber

Again, the problem here is that I don’t know how many dashes will be at the end.

>Solution :

To remove fixed character at the end of string (in this case -), try:

$number = "101-239204-9230---";
echo rtrim($number, '-');

Documentation: rtrim – Strip whitespace (or other characters) from the end of a string