想了解PHP字符过滤函数去除字符串最后一个逗号(rtrim)的相关内容吗，在本文为您仔细讲解PHP字符过滤函数的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：字符过滤函数,rtrim，下面大家一起来学习吧。
首先分别解释下,
trim过滤字符串两端,
rtrim过滤字符串尾部,=chop()
ltrim过滤字符串首部.
过滤字符串中键的咚咚就只能用str_replace咯.
举个例子说明下,
PHP代码
$str = '123,333,234,';
echo rtrim($str, ',');
rtrim实例代码2
<?php
$text = "\t\tThese are a few words :) ... ";
$trimmed = rtrim($text);
// $trimmed = "\t\tThese are a few words :) ..."
$trimmed = rtrim($text, " \t.");
// $trimmed = "\t\tThese are a few words :)"
$clean = rtrim($binary, "\x00..\x1F");
// trim the ASCII control characters at the end of $binary
// (from 0 to 31 inclusive)
?>
