How do I remove a comma off the end of a string?
PhpPhp Problem Overview
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?
Php Solutions
Solution 1 - Php
$string = rtrim($string, ',');
Solution 2 - Php
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");
Solution 3 - Php
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
Solution 4 - Php
If you're concatenating something in the loop, you can do it in this way too:
$coma = "";
foreach($a as $b){
$string .= $coma.$b;
$coma = ",";
}
Solution 5 - Php
have a look at the rtrim function
rtrim ($string , ",");
the above line will remove a char if the last char is a comma
Solution 6 - Php
if(substr($str, -1, 1) == ',') {
$str = substr($str, 0, -1);
}
Solution 7 - Php
A simple regular expression would work
$string = preg_replace("/,$/", "", $string)
Solution 8 - Php
rtrim ($string , ","); is the easiest way.
Solution 9 - Php
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,', ');
Solution 10 - Php
Precede that with:
if(substr($string, -1)==",")