<html><body>echo substr_replace("world","Hello ",0,0);</body><!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_func_string_substr_replace4 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:51:07 GMT --></html>