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<?php
/*
 *** Bruteforce algo ***
 * c = first(P)
 * while(c != ^)
 * if valid(c, P) then output(P, c)
 * c = next(P, c)
 *** Variables ***
 * P = problem
 * c = candidate solution for P
 * ^ = null data
**/

/*
 * Generate the first candidate solution
**/
function first_c(&$P) {/**/}

/*
 * Generate the next candidate solution based on the last.
 * Returns null if there's no next candidate
**/
function next_c(&$P, $c) {/**/}

/*
 * Checks if the solution candidate is valid
 * Returns true of false
**/
function valid(&$c, &$P) {/**/}

/*
 * Prints out the solution to the problem.
**/
function output($P, $c) {/**/}

$c = first_c($P);
while($c != null)
{
	if(valid($c, $P) == true) output($P, $c);
	$c = next_c($P, $c);
}
?>