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

User · Answer

have a look at the rtrim function   rtrim   string           the above line will remove a char if the last char is a comma

User · Answer

Precede that with   if substr  string  -1

User · Answer

A simple regular expression would work   string   preg replace              string

User · Answer

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

User · Answer

rtrim   string         is the easiest way

User · Answer

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

User · Answer

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

User · Answer

if substr  str  -1  1                str   substr  str  0  -1        http   php net manual en function substr php

User · Answer

string   rtrim  string          Docs for rtrim here

User · Answer

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

[php] How do I remove a comma off the end of a string?

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