Accept <br> for new line but filter html tags in php

I want my input or textarea value only accept <br> for having new lines

$comment = trim($comment);
$comment = stripslashes($comment) ;

Although I do wa开发者_如何学运维nt to accept <br> for new lines but I dont want to accept html tags

any suggestion ?

The better solution is to allow users to enter new lines in text areas, and translate them to <br> tags when you display the text with nl2br.

When you display the text, first encode html entities, then translate the newlines to <br> tags. If you use nl2br before htmlspecialchars, you'll wind up encoding the <br> tags as well.

echo (nl2br(htmlspecialchars($text));

You can allow the text area to take newline characters. Then you can use those as <br>s, just replace them after trimming and stripping all tags, or use a tool to display plain text as html.

You shouldn't be calling stripslashes, unless you're in the middle of building an SQL query.

you can use strip_tags which takes $allowable_tags as its second parameter:

$comment = strip_tags($comment, '<br>');

http://www.php.net/manual/en/function.strip-tags.php