What's the easiest way to remove a comma from the END of a list?

I'm sure you guys have dealt with this before when generating a list using a loop.

Let's say I have:

$var = "one, two, three, four, five, ";

and

$var2 = "one , ";

What would be the easiest way to remove the commas only from the end?
So that:

$var = "one, two, three, four, five ";

and

$var2 = "one ";

 

$var = preg_replace('/,\s*$/', '', $var);

PHP:

Regular expression would be my choice

 

Also, if you want to keep the space there use

$var = preg_replace('/,(\s*)$/', '$1', $var);

PHP:

 

you can use substr function
$var = substr($var,0,-1);

 

Thanks guys!

 

<?php
/**************************
* Remove Ending Comma
***************************
* Written by Joel Larson (Coded Caffeine)
*   http://thejoellarson.com/
* Date: 23.12.09
*
* Removes the comma at the end of a string, if present.
**************************/

# Sample String.
$string = 'This is a test string with a comma,';

/**
* remove_end_comma()
* PARAM: $input (The string to use)
* RETURNS: -Nothing-
*
* Takes the $input variable (in this case, $string) and overwrites it.
*/
function remove_end_comma(&$input)
{
	# Set the total length of the input.
	$length = strlen(trim($input));
	
	# If the total length - 1 has a comma, then...
	if( strpos($input, ',', --$length) !== FALSE )
		# Remove the comma and overwrite the input.
		$input = substr($input, 0, -1);
}

# Call the function.
remove_end_comma($string);

# $string no longer has a comma at the end.
echo $string;

PHP:

If you want more explanations, feel free to ask.

 

rtrim($string, ', '); // removes both commas and spaces from the end of the string

PHP:

 

To say "That's enthusiasm!", would be a gross understatement.

Tings dat make ya go, "Hmmm."

 

Well the idea of the function I wrote is:

Check if the comma is there
If it is, remove it.
If it's not, leave it alone.

I tend to over-think, but it's not a bad thing.

 

print_r(explode(', ', $var));

PHP: