gistfile1.txt

/* Creates random keys for confirm checkbox */
function generate_confirm_key($length = 50) {
    $characters = '-0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_';
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, strlen($characters) - 1)];
    }
        return $randomString;
}

/* Add comment confirm checkbox */
function insert_comment_checkbox() { 
        echo '<div style="width:100%;height:1px;margin-bottom:20px"></div>';
        echo '<input type="checkbox" name="confirm-' . generate_confirm_key() . '" id="confirm-' . generate_confirm_key() . '" value="true" required><label for="confirm-' . generate_confirm_key() . '"><div style="margin-top:-4px;margin-left:4px;color:#CC0000">Confirm</div></label></form>';     
}

/* Add comment confirm action */
add_action( 'comment_form', 'insert_comment_checkbox' );

/* Add login confirm checkbox */
function insert_login_checkbox() { 
        echo '<p class="forgetmenot"><label for="confirm-' . generate_confirm_key() . '"><input type="checkbox" name="confirm-' . generate_confirm_key() . '" id="confirm-' . generate_confirm_key() . '" value="true" required><label for="confirm-' . generate_confirm_key() . '"> <span style="color:#CC0000">Confirm</span></label></p><br /><br />';    
}

/* Add login confirm action */
add_action( 'login_form', 'insert_login_checkbox' );