PHP htmlentity允许< b>和< i>只要
问题描述：
使用htmlentities()有没有办法我可以设置为仅允许<b>和<i>转换为粗体和斜体文本?我知道有一种方法可以做到这一点，但是我已经忘记了.
Using htmlentities() is there a way I can set to allow only <b> and <i> to convert into bold and italic text? I know there was one way of doing this, but i have forgotten.
答
非常简单
<?php
$string = htmlentities($text);
$string = str_replace(array("<i>", "<b>", "</i>", "</b>"), array("<i>", "<b>", "</i>", "</b>"), $string);