Numbers replace

[dk4210]

Hey Guys,

What function can I use to replace numbers.. For example if I wanted to have php mailer email the credit card number say 111111111111 to the admin but I want to replace most of the numbers like this

 

**********1111 for example.. What function would I use?

 

Thanks, Dan

[Gmunky]

 

$number= 111111111111;

 

$newnumber= "********" . substr($number,12,4);