如何设置逻辑正确的方式使用后变量 - how to set logic the right way to use post variables

你好，我对每个页面头部的以下代码有问题:

session_start();
if (!isset($_SESSION['a'])){
    ...create the session from some variables...
$_SESSION['a'] = $var;
$var = $_SESSION['a'];
}else{
    $var = $_SESSION['a'];
    $what = "some text";
    if (isset($_POST['one']) ){
        $var = "new input";
            $_SESSION['a'] = $var;
        echo "one was posted";
    }
    if (isset($_POST['two']) ){
            $var = "new input";
            $_SESSION['a'] = $var;
        echo "two was posted";
    }   
}

要发布的表单放在页脚:

<form action="'.$_SERVER['PHP_SELF'].'" method="post">      
    <input type="submit" id="one" name="one"/><div>set one</div>
</form>
<form action="'.$_SERVER['PHP_SELF'].'" method="post">  
    <input type="submit" id="two" name="two"/><div>set two</div>
</form>

上面代码背后的逻辑似乎有问题。当调用页面，并发送post issue时，它不会回显，也不会将会话更改为新值。

所以如果有人能帮我，我真的很感激。

谢谢。更新:

好的，代码完全工作到"else"部分:

else{
    $var = $_SESSION['a'];
    if (isset($_POST["one"]) ){
        echo "post one was send";
    }
    if (isset($_POST["two"]) ){
        echo "post en was send";
    }
echo "session already exists.";
}

这部分只显示回显:session已经存在。整个帖子短语不起作用。根据一些变量，页脚将被嵌入。因此，整个HTML内容将被回显:

echo '...
      <ul class="drop_down">
    <form action="'.$_SERVER['PHP_SELF'].'" method="post">      
        <input type="submit" id="one" name="one value="one"/><div>set one</div>
    </form>
    <form action="'.$_SERVER['PHP_SELF'].'" method="post">  
        <input type="submit" id="two" name="two" value="two"><div>set two</div>
    </form>
      </ul>
     ...';

Change Your Form

   <form action="<?=$_SERVER['PHP_SELF']?>" method="post">      
   <input type="submit" id="one" name="one" value="one"/><div>set one</div>
   </form>
<form action="<?=$_SERVER['PHP_SELF']?>" method="post">  
   <input type="submit" id="two" name="two" value="two"/><div>set two</div>
</form>

value需要发送…

编辑# 1:

在我的系统中，这工作得很好。

        <?php
        session_start();
        if (!isset($_SESSION['a'])){
           $var='hi';
        $_SESSION['a'] = $var;
        $var = $_SESSION['a'];
        }else{
            $var = $_SESSION['a'];
            $what = "some text";
            if (isset($_POST['one']) ){
                $var = "new input";
                    $_SESSION['a'] = $var;
                echo "one was posted";
            }
            if (isset($_POST['two']) ){
                    $var = "new input";
                    $_SESSION['a'] = $var;
                echo "two was posted";
            }   
        }
        ?>
        <form action="<?=$_SERVER['PHP_SELF']?>" method="post">      
            <input type="submit" id="one" name="one"/><div>set one</div>
        </form>
        <form action="<?=$_SERVER['PHP_SELF']?>" method="post">  
            <input type="submit" id="two" name="two"/><div>set two</div>
        </form>

编辑# 2

再试一次…

        if (!isset($_SESSION['a'])){
           $var='hi';
        $_SESSION['a'] = $var;
        $var = $_SESSION['a'];
        }else{
            $var = $_SESSION['a'];
            $what = "some text";
            if (isset($_POST['one']) ){
                $var = "new input1";
                    $_SESSION['a'] = $var;
                echo "one was posted";
                print_r($_SESSION);
            }
            if (isset($_POST['two']) ){
                    $var = "new input2";
                    $_SESSION['a'] = $var;
                echo "two was posted";
                print_r($_SESSION);
            }   
        }
        ?>
        <form action="<?=$_SERVER['PHP_SELF']?>" method="post">      
            <input type="submit" id="one" name="one"/><div>set one</div>
        </form>
        <form action="<?=$_SERVER['PHP_SELF']?>" method="post">  
            <input type="submit" id="two" name="two"/><div>set two</div>
        </form>

这里session打印正确

格式:

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">      
    <input type="submit" id="one" name="one" value='one'/><div>set one</div>
</form>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">  
    <input type="submit" id="two" name="two"value='two' /><div>set two</div>
</form>

Php:

<?php
    session_start();
    if (!isset($_SESSION['a'])){
        $var = 1;
        $_SESSION['a'] = $var;
        //$var = $_SESSION['a']; this is unnecessary 
    }else{
        $var = $_SESSION['a'];
        $what = "some text";
        if (isset($_POST['one']) ){
            $var = "one";
            $_SESSION['a'] = $var;
            echo "one was posted";
        }
        if (isset($_POST['two']) ){
            $var = "two";
            $_SESSION['a'] = $var;
            echo "two was posted";
        }   
    }
?>

这部分需要澄清。你到底想干什么?

if (!isset($_SESSION['a'])){
...create the session from some variables...
$_SESSION['a'] = $var;
$var = $_SESSION['a'];
}else{
$var = $_SESSION['a'];
$what = "some text";

试试这个:

    <?PHP
session_start();
if (isset($_POST['one']) )
    {
      $_SESSION['a'] = "langauage one";
      echo "one was posted";
    }
    elseif (isset($_POST['two']) )
        {
            $_SESSION['a'] = "langauge two";
            echo "two was posted";
        }   
        else
            {
                if (!isset($_SESSION['a']))
                    {
                        $_SESSION['a'] = "default langauge";
                    }
            }

下面是SELECT

的例子

    <?PHP
    session_start();
    if (isset($_POST['language']) )
    {
      $_SESSION['a'] = $_POST['language'];
      echo "Language has ben set to ".$_POST['language'];
    }
    else
        {
            if (!isset($_SESSION['a']))
                {
                    $_SESSION['a'] = "default langauge";
                }
        }
?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<select title="Please choose your Language" name="language">    
     <option value="langauage one">langauage one</option>
     <option value="langauge two">langauge two</option>
</select>
</form>