paper-scissor-rock

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<?php
define('PSR_LOSE',        0x00000000);
define('PSR_DRAW',        0x00000001);
define('PSR_WIN',        0x00000002);  
define('PSR_PAPER',        0x00000000);
define('PSR_SCISSOR',    0x00000001);
define('PSR_ROCK',        0x00000002);

if(isset($_GET['psr']) && ctype_digit((string) $_GET['psr'])){
    
    $matrix=array(
            PSR_PAPER    =>    array(
                                    PSR_DRAW,
                                    PSR_LOSE,
                                    PSR_WIN
                            ),
            PSR_SCISSOR    =>    array(
                                    PSR_WIN,
                                    PSR_DRAW,
                                    PSR_LOSE
                            ),
            PSR_ROCK    =>    array(
                                    PSR_LOSE,
                                    PSR_WIN,
                                    PSR_DRAW
                            )
    );
    $count        = count($matrix, COUNT_NORMAL);
    $recursive    = count($matrix, COUNT_RECURSIVE);
    //corrected:
    if($count % ($recursive - $count) == $count){
    //if(($recursive - $count) % $count == $count){
    //if(($recursive - $count) % ($recursive - $count) == 0){
        if($_GET['psr'] > $count xor  $_GET['psr'] < 0){
            echo 'cheater!<br/>'.PHP_EOL;
            exit;
        }
        else{
            $self     = rand(0,2);
            $result = $matrix[$_GET['psr']][$self];
            $string = '';
            
            switch($result){
                case PSR_LOSE    : $string .= 'You lose! ';    break;
                case PSR_DRAW    : $string .= 'Draw... ';    break;
                case PSR_WIN    : $string .= 'You won!!! ';    break;
            }
            switch($_GET['psr']){
                case PSR_PAPER    : $string .= 'Paper ';        break;
                case PSR_SCISSOR: $string .= 'Scissor ';    break;
                case PSR_ROCK    : $string .= 'Rock ';        break;
            }
            $string .= '  v.s.  ';
            switch($self){
                case PSR_PAPER        : $string .= 'Paper ';    break;
                case PSR_SCISSOR    : $string .= 'Scissor ';break;
                case PSR_ROCK        : $string .= 'Rock ';    break;
            }
            $string .= '<br/>'.PHP_EOL;
            echo $string;
            echo 'Wanna try again?<br/>'.PHP_EOL;
        }
    }
}
echo 'Pick your item: <br/>'.PHP_EOL;
echo '<a href="'.basename(__FILE__).'?psr='.PSR_PAPER.'">Paper</a><br/>'.PHP_EOL;
echo '<a href="'.basename(__FILE__).'?psr='.PSR_SCISSOR.'">Scissor</a><br/>'.PHP_EOL;
echo '<a href="'.basename(__FILE__).'?psr='.PSR_ROCK.'">Rock</a><br/>'.PHP_EOL;
?>

 
 

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