substr($string, $position, 0) = $what_you_want_inserted; where $string = the string you need to have something inserted into $position is where you want to have something inserted (a numerical value such as 0{for the first},1,2,3,4,5,etc) $what_you_want_inserted is what you want to insert in the string $string at position $position hope this helps

Originally posted as a Categorized Answer.