Specific color for a letter! Help!

[yagga]

Hello everyown!

 

Im a newbie so please excuse me.

 

I need a code that changes the letter "O" in the color yellow, anytime i use it.

So for example if use the words  "hello my name is otto" in my HTML code and i preview it in my browser, that all "O" letters are the color yellow etc. They told me that i need some PHP code because its not possible in HTML.

 

Hope someown can help me out!..

 

Thanks!

[premiso]

$string = 'Hello, my name is otto!';
$string = str_replace("o", '<span style="color: yellow;">o</span>', $string);

echo $string;

[yagga]

Thanks for the fast reply!

 

Are all the "O" of my words yellow? not only for the string:  hello my name it otto?