The rtrim Function

The rtrim function removes whitespace from the end of a string. It can also remove other characters if they are specified as the second parameter.

Syntax

rtrim(string $string, string $characters = " \t\n\r\0\x0B"): string

Let's remove the whitespace from the right:

<?php
	echo rtrim(' abcde ');
?>

Code execution result:

' abcde'

Let's remove the slashes from the right:

<?php
	echo rtrim('/abcde/', '/');
?>

Code execution result:

'/abcde'

Let's remove slashes and dots from the right:

<?php
	echo rtrim('abcde/', '/.');
?>

Code execution result:

'abcde'

The function removes any number of the specified characters if they are on the edge:

<?php
	echo rtrim('abcde/../../', '/.');
?>

Code execution result:

'abcde'

You can specify a range of characters using two dots '..'. For example, let's specify that we want to remove characters from 'a' to 'd':

<?php
	echo rtrim('xabcde', 'a..e');
?>

Code execution result:

'x'