Question

I am creating a glossary for my website that will display definitions for terms on my site.

I have everything working. But I would like to show a 404 if my uri segment 3 contains anything other than the letters in the alphabet.

My glossary urls currently look like:

www.mydomain.com/tools/glossary/a
www.mydomain.com/tools/glossary/b
www.mydomain.com/tools/glossary/c
...

I want to show a 404 if the user enters a string that is not in the alphabet:

example

www.mydomain.com/tools/glossary/tree

In my glossary function I have added the following:

        if($this->uri->segment(3)) {
            if($this->uri->segment(3) !== 'a' || 'b' || 'c' .... 'z') {
                show_404();
            }
        }

How can I get the above code to work??

Show a 404 if the 3rd uri segment does not equal a letter between a and z??

Answer 1

You could try this (controller tools.php)

  function glossary($letter)  
  {
   if(!preg_match('/^[a-z]$/',$letter))
    {
       show_404();
    }
    else
    {
      echo 'match';
      //do something with $letter
    }
   }

Tests:

a  'match'
b  'match'
ab  404
1   404