JuniorTheoryCommon

What does the program print (lines separated by spaces)?

PHP

<?php

$nums = [3, 1, 2];
$result = sort($nums);
var_dump($result);
echo implode(' ', $nums), "\n";

bool(true) 1 2 3

Expecting $nums to stay 3 1 2 because an array parameter is a copy: sort declares its parameter by reference, so it reorders the caller's array itself.
Expecting sort to return the sorted array: it returns only true, so $sorted = sort($a) leaves true in $sorted and the new order in $a.

JuniorTheoryCommon

PHP

<?php

$nums = [3, 1, 2];
$result = sort($nums);
var_dump($result);
echo implode(' ', $nums), "\n";

bool(true) 1 2 3

Expecting $nums to stay 3 1 2 because an array parameter is a copy: sort declares its parameter by reference, so it reorders the caller's array itself.
Expecting sort to return the sorted array: it returns only true, so $sorted = sort($a) leaves true in $sorted and the new order in $a.