Is it possible to find a letter on its own in a string for example

PHP Code:

$var = "hello o hello o";
$str_replace = str_replace("o","<b>o</b>",$text); 


but i only want to replace the o thats on its own and not in the hello?

if the 'o' is always preceeded by a space then use ' o'

yea, its quite simple you use:

PHP Code:

$var = "hello o hello o";
$str_replace = str_replace(" o ","<strong>o</strong>",$text); 


Lol that will only replace o's which have a space at the begining and end

btw <strong> is better than <b> aparently so its better to use it

same as <em> instead of <i>

Hope this helps

Talkupation Apprieciated
Dan

or you could use preg_replace()

If it is not the same character each time, you can use preg_replace as hafio says. Something like:

PHP Code:

$str = preg_replace('#(\b)([\w]{1})(\b)#', '$1<strong>$2</strong>$3', $str); 


Maybe some more details would help us give a more pesific response