神秘地设置自己的Cookie

Question

When the condition of the first if statement is met, the cookie "c2" is also set. I'm really scratching my head here. Any ideas? FYI this is the only code that handles cookies on this page.

<?php
    //set cookies on correct answers
    if ( $_POST['answer-1'] == 'rob' ) :
        $c1 = 'correct';
        setcookie('c1', 'correct');
    endif;
    if ( $_POST['answer-2'] == 'blue' ) :
        $c2 = 'correct';
        setcookie('c2', 'correct');
    endif;

    //reset cookies
    if ( !empty($_POST['reset']) ) :
        $_COOKIE['c1'] = ''; 
        $_COOKIE['c2'] = '';
    endif;

    $c1c = $_COOKIE['c1'];
    $c2c = $_COOKIE['c2'];
?>

Answer 1

This:

//reset cookies
if ( !empty($_POST['reset']) ) :
    $_COOKIE['c1'] = ''; 
    $_COOKIE['c2'] = '';
endif;

will reset the global $_COOKIE array with these values. But a page reload will still populate that again, as the cookies are still valid and stored in the browser.

In order to also delete them from the browser, you need:

//reset cookies
if ( !empty($_POST['reset']) ) :
    $_COOKIE['c1'] = ''; 
    $_COOKIE['c2'] = '';
    setcookie('c1', '', -3600);
    setcookie('c2', '', -3600);
endif;