<html><body>// Positive numbers:echo substr("Hello world",0,10)."<br>";echo substr("Hello world",1,8)."<br>";echo substr("Hello world",0,5)."<br>";echo substr("Hello world",6,6)."<br>";echo "<br>";// Negative numbers:echo substr("Hello world",0,-1)."<br>";echo substr("Hello world",-10,-2)."<br>";echo substr("Hello world",0,-6)."<br>";</body><!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_func_string_substr3 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:51:07 GMT --></html>