Convert the first letter to Capital letter but ONLY for UPPERCASE strings - PHP
<p>Anyone could help me doing this?</p>

<p>For example I have a string of</p>

<pre><code>SOME of the STRINGS are in CAPITAL Letters
</code></pre>

<p>What I want exactly for the output is</p>

<pre><code>Some of the Strings are in Capital Letters
</code></pre>

<p>Only those in UPPERCASE will be turn their first letter to capital and leave the rest as lower case.</p>

<p>How can I achieve this using PHP?</p>

<p>Thanks in advance.</p>
