preg_match('~^/[a-z]{2}(?:/|$)~', $_SERVER['REQUEST_URI']

Question

Asked: May 13, 20262026-05-13T09:48:37+00:00 2026-05-13T09:48:37+00:00

I downloaded a framework and they are using this as a css selector: #Footer

I downloaded a framework and they are using this as a css selector:

#Footer .footerTop

Why not just use:

.footerTop

Are they the same, or selection is different?

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Editorial Team · Answer 1 · 2026-05-13T09:48:37+00:00

Editorial Team

#Footer .footerTop only applies to the .footerTop within #Footer

<div id="Footer">
  <div class="footerTop">I qualify</div>
</div>
<div id="Copyright">
  <div class="footerTop">I don't qualify</div>
</div>

Using just .footerTop would apply rules to both of the inner DIV elements, losing its specificity.