How to convert a string to utf-8 code in php
<p>i need a function or a simple algo to help me convert a normal string to utf-8 code</p>

<p>ex: 
string:</p>

<pre><code>hello
عربي
</code></pre>

<p>UTF-8 CODE:</p>

<pre><code>68 65 6C 6C 6F 0A 0639 0631 0628 064A 0A
</code></pre>
