1//Remove the last character using substr
2$string = substr($string, 0, -1);
1$arrStr = 'Str1, Str2, str3, ';
2echo rtrim($arrStr, ", "); //Str1, Str2, str3
3echo substr_replace($arrStr, "", -2); //Str1, Str2, str3
4echo substr($arrStr, 0, -2); // Str1, Str2, str3