测试代码：
<?<span php
</span><span $str</span> = <span rtrim</span>('article_list.html', '.html'<span );
</span><span echo</span> <span $str</span><span ;
</span><span echo</span> '<br />'<span ;
</span><span $str</span> = <span rtrim</span>('article_index.html', '.html'<span );
</span><span echo</span> <span $str</span><span ;
</span><span echo</span> '<br />'<span ;
</span><span $str</span> = <span rtrim</span>('articleABCT.html', '.html'<span );
</span><span echo</span> <span $str</span><span ;
</span><span echo</span> '<br />'<span ;
</span>?>
显示结果：
article_index
articleABCT
WINNT Apache/2.2.16 (Win32) PHP/5.2.14(本地PHPnow 1.5.6-1)
Linux Apache 2.0 PHP/5.2.17p1(wdcp_v2.5.7)
Linux LiteSpeed PHP/5.2.17(梦游主机)
Linux Apache 2.0 PHP/5.2.17(主机无忧)
PHP rtrim函数bug
