select 1 random keyword per line in txt
<pre><code>$kw=explode("\n",file_get_contents("keyword.txt"));
shuffle($kw);
</code></pre>

<p>keyword.txt is just keyword in line, example :</p>

<pre><code>keyword1
keyword2
keyword3
keyword4
keyword5
keyword6
keyword7
keyword8
keyword9
</code></pre>
