unique number from a string - php
<p>I have some strings containing alpha numeric values, say </p>

<p><code>asdf1234</code>, </p>

<p><code>qwerty//2345</code> </p>

<p>etc.. </p>

<p>I want to generate a specific constant number related with the string. The number should not match any number generated corresponding with other string..</p>
