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

Answer 1

If you're concatenating something in the loop, you can do it in this way too:

$coma = "";
foreach($a as $b){
    $string .= $coma.$b;
    $coma = ",";
}

Answer 2

I had a pesky "invisible" space at the end of my string and had to do this

 $update_sql=rtrim(trim($update_sql),',');

But a solution above is better

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

Answer 3

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

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

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

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

}

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

Answer 6

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");