php generate all possible values of characters
<p>I would like a function to generate all possible combination of alphabets. The only parameter the function would need is the number of characters. So for instance if I pass '2', it'll generate:</p>

<pre><code>aa
ab
ac
ad
ae
..
..
zz
</code></pre>

<p>If I pass 3, it'll generate:</p>

<pre><code>aaa
aab
...
...
aaz
...
zzz
</code></pre>

<p>And so on if I pass 4, etc. Thank you in advance!</p>
