with out dead php script
<p>I wanna run one php script by <code>while(true){ }</code>.</p>

<p>It will get pm which has been sent to me by other and answer them.(something like yahoo robot)</p>

<p>now if I set <code>set_time_limit(0)</code> and use <code>while(true)</code> and run this page on my server <code>http://ip-address/yahoo.php</code> and close my browser , Is it running for ever? </p>
