PHP puzzle
So I've decided to make a little PHP puzzle.
The following program contains 3 test cases that you need to make pass. To do
that, you should replace XXX in the assignments to $a, $b and $c by the
right magic values.
<?php
header('Content-Type: text/plain');
function t_1($x) {
switch ($x) {
case 'one': return false;
case 0: return !is_string($x);
default: return false;
}
}
function t_2($x) {
$k = array('one thousand', 2000, 'a363b8d13575101a0226e8d0d054f2e', 'php');
return in_array(md5($x), $k);
}
function t_3($x) {
$k = '1020304050607';
$x = (string)$x;
return strlen($x) < strlen($k) && $x == $k;
}
echo "1..3\n";
$a = XXX;
echo t_1($a) ? 'ok 1' : 'not ok 1', "\n";
$b = XXX;
echo t_2($b) ? 'ok 2' : 'not ok 2', "\n";
$c = XXX;
echo t_3($c) ? 'ok 3' : 'not ok 3', "\n";
If you've done everything right, the output should look like this:
1..3
ok 1
ok 2
ok 3
(Thanks to http://www.reddit.com/r/lolphp for inspiration.)
I blog about Perl.
The first one is easy. The second is a little more of a challenge. The third, I'm still thinking about.
OK, here are the answers, base64-encoded so as not to spoil the fun. There are at least two correct answers for
$a; and theoretically an infinite number of solutions for$b.function reveal ($answer) { return eval("return(".base64_decode($answer).");"); } $a = reveal('bnVsbA=='); $b = reveal('NDM0Mw=='); $c = reveal('JzB4RUQ4RURDNDlBRic=');