string - How to replace the characters in fixed positions in PHP?

Question

I want to replace with the 4~8 characters of a string with *,how to do it?

HelloWorld

=>

Hell****ld

Answer 1

use

substr_replace()

like

substr_replace($string, '****', 4 , 4);

read more :

http://php.net/manual/en/function.substr-replace.php