存储随机值、$_SESSION 和 $_POST 问题

我正在制作类似的东西captha，不起作用的部分是if，在if（isset（$_POST['submit']）下），它总是返回false。我认为。尝试了很多方法，但没有运气...无论如何，我已经遵循了这个解决方案 https://stackoverflow.com/a/21504949/4167976 但没有成功。

这是我的测试php和html：

<?php
session_start();
$char = "abcdefghijklmnopqrstuvwxyz1234567890";
$code = $char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)];
$_SESSION["testcode"] = $code;
echo $_SESSION["testcode"]."<br>"; // echo here only for testing
if(isset($_POST['submit'])) {
    $code1 = mb_substr($_POST['fullcode'], 0, 5);
    $code2 = mb_substr($_POST['fullcode'], -6);
    if ($code2 == $_SESSION["testcode"])
        {echo "The code is correct!";}
    else
        {echo "Wrong code!";}
    // unset($_SESSION['testcode']); // ???
}
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<input type="text" name="fullcode">
<input type="Submit" name="submit" value="Submit!">
</form>
</body>
</html>

请告诉我我错了什么以及在哪里...谢谢！:)

编辑：

<?php
session_start();
if (!isset($_SESSION["testcode"])) {
    $char = "abcdefghijklmnopqrstuvwxyz1234567890";
    $code = $char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)];
    $_SESSION["testcode"] = $code;
}
if(isset($_POST['submit'])) {
    $code1 = mb_substr($_POST['fullcode'], 0, 5);
    $code2 = mb_substr($_POST['fullcode'], -6);
    if ($code2 === $_SESSION["testcode"])
        {echo "The code is correct!<br>";}
    else
        {echo "Wrong code!<br>";}
    unset($_SESSION['testcode']);
    $char = "abcdefghijklmnopqrstuvwxyz1234567890";
    $code = $char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)];
    $_SESSION["testcode"] = $code;
}
?>

最后，如果条件为假，则获取一个新代码！

<?php
session_start();
// first request.
// if not set session 'testcode' and set it, else do nothing.
// prevent session be covered.
if (!isset($_SESSION["testcode"])) {
    reFreshCode();
}
if(isset($_POST['submit'])) {
    $code1 = mb_substr($_POST['fullcode'], 0, 5);
    $code2 = mb_substr($_POST['fullcode'], -6);
    if ($code2 == $_SESSION["testcode"])
        echo "The code is correct!";
    else {
        // get a new code IF the condition is false!
        echo "Wrong code!";
        echo “new code：”.reFreshCode();
    }
}
function reFreshCode() {
    $char = "abcdefghijklmnopqrstuvwxyz1234567890";
    $code = $char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)].$char[rand(0,35)];
    return $_SESSION["testcode"] = $code;
}

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