使用str_replace的php意外输出

Question

i'm having the following php code:

    $html = '<p>[tag]</p>';
    $test = "<a href='#'><div class='test'>button</div></a>";
    $html = str_replace("[tag]", $test, $html);

when using echo htmlentities($html) i'm getting the expected result:

<p><a href='#'><div class='test'>button</div></a></p> 

but when echoing the $html, firefox renders it like this:

<p>
<a href="#"></a>
</p>
<div class="test">
<p></p>

which is very strange .. any ideas what's wrong?

thanks

EDIT: i found out that it's only wrong when checking with firebug. when displaying the browser's source, it show's up as expected. nevertheless, to the browser it seems to be invalid html markup ..

Answer 1

I believe it's because you can't have block level elements inside inline elements. Similar to that you can't put a <p> tag inside a <span> tag.

HTML 4.01 specifies that <a> elements may only contain inline elements. A <div> is a block element, so it may not appear inside an <a>.