how do i remove a comma off the end of a string?

Question

I want to remove the comma off the end of a string. As it is now i am using

$string = substr($string,0,-1);

but that only removes the last character of the string. I am adding the string dynamically, so sometimes there is no comma at the end of the string. How can I have PHP remove the comma off the end of the string if there is one at the end of it?

Answer 1

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

Answer 2

Precede that with:

if(substr($string, -1)==",")

Answer 3

if(substr($str, -1, 1) == ',') {

  $str = substr($str, 0, -1);

}

http://php.net/manual/en/function.substr.php

Answer 4

have a look at the rtrim function

rtrim ($string , ",");

the above line will remove a char if the last char is a comma

Answer 5

A simple regular expression would work

$string = preg_replace("/,$/", "", $string)

Answer 6

rtrim ($string , ","); is the easiest way.

Answer 7

i guess you're concatenating something in the loop, like

foreach($a as $b)
  $string .= $b . ',';

much better is to collect items in an array and then join it with a delimiter you need

foreach($a as $b)
  $result[] = $b;

$result = implode(',', $result);

this solves trailing and double delimiter problems that usually occur with concatenation

Answer 8

This is a classic question, with two solutions. If you want to remove exactly one comma, which may or may not be there, use:

if (substr($string, -1, 1) == ',')
{
  $string = substr($string, 0, -1);
}

If you want to remove all commas from the end of a line use the simpler:

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

The rtrim function (and corresponding ltrim for left trim) is very useful as you can specify a range of characters to remove, i.e. to remove commas and trailing whitespace you would write:

$string = rtrim($string, ", \t\n");