PHP字符过滤函数去除字符串最后一个逗号(rtrim)

　　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

复制代码代码如下:

　　$str = '123,333,234,';

　　echo rtrim($str, ',');

　　rtrim实例代码2

复制代码代码如下:

　　<?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)

　　?>