Php 存储随机值、$\u会话和$\u发布_Php_Html_Session_Post

Php 存储随机值、$\u会话和$\u发布

php html session post

Php 存储随机值、$\u会话和$\u发布,php,html,session,post,Php,Html,Session,Post,我正在制作一个类似于captha的东西，不起作用的部分是IF，在IF（isset（$_POST['submit']）下，它总是返回false。我想。尝试了很多方法却没有成功。。。无论如何，我遵循这个解决方案，但没有成功以下是我对php和html的测试： <?php session_start(); $char = "abcdefghijklmnopqrstuvwxyz1234567890"; $code = $char[rand(0,35)].$char[rand(0,35)].$c

我正在制作一个类似于captha的东西，不起作用的部分是IF，在IF（isset（$_POST['submit']）下，它总是返回false。我想。尝试了很多方法却没有成功。。。无论如何，我遵循这个解决方案，但没有成功

以下是我对php和html的测试：

<?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>


在每次加载时覆盖测试代码，$\u会话[“testcode”]=$code。首先检查它是否已提交。除了@chris85所说的以外；将该会话分配给隐藏的输入，然后进行比较。您可能还必须使用单独的页面。将值存储在$\u会话中而不是隐藏的文本字段中不是更好吗？@Devilix隐藏的输入仅用于测试，应该从Finalil中删除，但如果代码错误，为什么不生成另一个新的？总是有相同的…一个客户端生成一个会话id，直到将其取消设置。因此，您可以获得客户状态。我不知道你的需要。一个简单的例子，创建一个重置按钮；我应该在isset（$_POST['submit']）下进行此操作，以获得一个新代码：unset（$_SESSION['testcode']）$char=“abcdefghijklmnopqrstuvxyz1234567890”$代码=$char[rand（0,35）]。$char[rand（0,35）]。$char[rand（0,35）]。$char[rand（0,35）]。$char[rand（0,35）]。$char[rand（0,35）]$_会话[“testcode”]=$code；对不起，您能解释一下为什么使用function方法，我不需要取消设置会话来获取新代码吗？很奇怪…：(
<?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;
}
?>

<?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;
}