[RESOLVED] Find character in string

[Jon12345]

I have a variable a, who's value could be anything but lets say it is "abcdefg".

How can I replace the character c with x? Is there some kind of find and replace in string function? Please note that nothing happens if it can't find c in the string.

Thanks,

Jon

[NogDog]

$newstring = str_replace('c', 'x', $oldstring);

[Jon12345]

Thank you!