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)
?>

php技术：PHP字符过滤函数去除字符串最后一个逗号(rtrim)，转载需保留来源！

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