JuniorTheoryCommon

What does the program print?

PHP

<?php

$s = 'JavaScript';
$t = str_replace('Java', 'Type', $s);
echo substr($s, 4), ' ', substr($s, -6, 3), ' ', $s, ' ', $t, "\n";

Script Scr JavaScript TypeScript

Expecting str_replace to change $s: it returns a new string, which lands in $t, while $s keeps JavaScript.
Counting substr positions from 1: the first character is at position 0, so substr($s, 4) starts at S and gives Script.

JuniorTheoryCommon

PHP

<?php

$s = 'JavaScript';
$t = str_replace('Java', 'Type', $s);
echo substr($s, 4), ' ', substr($s, -6, 3), ' ', $s, ' ', $t, "\n";

Script Scr JavaScript TypeScript

Expecting str_replace to change $s: it returns a new string, which lands in $t, while $s keeps JavaScript.
Counting substr positions from 1: the first character is at position 0, so substr($s, 4) starts at S and gives Script.