Replace character's position in a string

Question

In PHP, how can you replace the second and third character of a string with an X so string would become sXXing?

The string\'s

Answer 1

For replacing, use function

$str    = 'bar';
$str[1] = 'A';
echo $str; // prints bAr

or you could use the library function substr_replace as:

$str = substr_replace($str,$char,$pos,1);

similarly for 3rd position