Hello World :)

I found this question in a php book and i like it , wanted to share ... even if its in php its not really specific to php language ... it's a nice way to make your code very hard to understand ...


<?php

function myfunction($a, $b = true)
{
if($a && !$b) {
echo "Hello, World!\n";
}

}


$s = array (

0 => "my",
1 => "call",
2 => '$function',
3 => ' ',
4 => "function",
5 => '$a',
6 => '$b',
7 => 'a',
8 => 'b',
9 => ''

);


$a = true;
$b = false;

/* Group A */
$name = $s[?].$s[?].$s[?].$s[?].$s[?].$s[?];
/* Group B */
$name(${$s[?]}, ${$s[?]});

?>

 

no one want to try ?

come on its not that hard ...

 

You guys r lazy

 

I got this far:

function myfunction($a, $b = true)
{
if($a && !$b) {
echo "Hello, World!\n";
}
}


$s = array (

0 => "my",
1 => "call",
2 => '$function',
3 => ' ',
4 => "function",
5 => '$a',
6 => '$b',
7 => 'a',
8 => 'b',
9 => ''

);


$a = true;
$b = false;

/* Group A */
$name = $s[9].$s[9].$s[9].$s[9].$s[0].$s[4];

/* Group B */
$name(${$s[1]}, ${$s[9]});


I couldn't understand why it wasn't working though. Param 1 is set, and param 2 isn't set so it boggled me a bit.

Took some thinking about those to even get that far, although it's really simple code it's a bit of a mind bender

Thanks for posting it though

 

I have the answer now Only through trial and improvement though

$name = $s[9].$s[9].$s[9].$s[9].$s[0].$s[4];
$name(${$s[7]}, ${$s[10]});

 

where did u get the 10 from ?

 

$name = $s[9].$s[9].$s[9].$s[9].$s[0].$s[4]; would result in $name = myfunction;
$name(${$s[7]}, ${$s[8]}); would result in myfunction($a, $b);
And myfunction($a, $b) (a.k.a. myfunction(true, false)) would result in "Hello, World!\n"

Hope I got it.

Best,
Wisher