String Mystery

[gorilla1]

I have a string $element="xxxxxx". I wish to change the second character from 'x' to 'p'. Seems like this should work:
substr_replace($element,"P",1,1);

But this makes no change at all. Why not?

G

[mordred]

The new string value is returned instead of working directly on the string.

PHP Code:

$element = "xxxxxx"; 
$element = substr_replace($element, "P", 1, 1); 
echo $element; 


[gorilla1]

Right... Thanks!

G