检查是否存在 PHP cookie 无效

Question

I am using this code to set a cookie in Wordpress

functions.php

function wp_test_req($post_id) { 
    if(isset($_POST['submits'])) {
        setcookie( 'mycookie', 'value', time()+ 36, '/');
    }
} 
add_action('init', 'wp_test_req');

HTML

and with this code then see if cookie exists

<form action="" method="post">
  <?php 
    if (!isset($_COOKIE['mycookie']))
    { echo '<input type="submit" value="Up+1" id="submit" name="submits">';}
    else { echo 'NotSet';}
  ?>
</form>

problem is if (!isset($_COOKIE['mycookie'])) not work.

In fact, the problem is that nothing happens in the first click, but changes are made in the second click

Where is wrong?

Thanks for any help

Answer 1

force $_COOKIE['mycookie'] for affect immediatly

<?php
if (!empty($_POST['submits'])) {
    setcookie('mycookie', 'value', time()+ 36);
    $_COOKIE['mycookie'] = 'value'; // <----
}
?>

<form action="" method="post">
  <?php
    if (empty($_COOKIE['mycookie'])) {
        echo '<input type="submit" value="Up+1" id="submit" name="submits">';
    } else {
        echo 'NotSet';
    }
  ?>
</form>