Question

我写了一个简短的PHP程序，显示了两张图片。使用2个单选按钮，您必须选择一个，然后您必须单击提交按钮。然后，页面保存对您选择的图片的投票，然后显示接下来的两张图片。我使用会话变量来存储，必须显示哪些图像。不幸的是，在第一次点击＆＃34; next＆＃34;之后，变量没有增加。按钮。之后，它运作得非常好。

有什么问题？

这是我的代码：

<?php   
    session_start();
    if (isset($_SESSION['image_nr'])) { /* If there is already a value set */
        $x = $_SESSION['image_nr'];

        echo $x;
    }   
    else { 

        $_SESSION['image_nr'] = 1; /* Set to 1 */
        $x = $_SESSION['image_nr'];
    }

    include('sql/db_connect.php');
    include('sql/queries.php');


    if($x == 9){
        increaseParticipants();
        $_POST['submit']='';
        $_SESSION['image_nr'] = 1;
        session_unset($_SESSION['image_nr']);
        header( "Location: thankyou.php" );
    }       
?>
<html>
    <header>
        <link rel="stylesheet" href="style.css">
        <script type="text/javascript" language="JavaScript" src="functions.js"></script>       
    </header>
    <body>
        <form action= "" method = "post">
            <div class='content' id='image1'><?php if($x == 1){echo"<img src='images/image_1.jpg' width='380'><br>Image 1";}?></div>
            <div class='content2' id='image2'><?php if($x == 1){echo"<img src='images/image_2.jpg' width='380'><br>Image 2";}?></div>

            <div id='bottom'>


                <input type='radio' name='radio' id='radio1' value='<?php echo $x; ?>' onchange="enableButton()"> Image <?php echo $x; ?> <br>
                <input type='radio' name='radio' id='radio2' value='<?php echo ($x+1);?>' onchange="enableButton()"> Image <?php echo $x+1; ?><br>
                <input type="submit" id="button" name= "submit" value="Next" onclick="saveClick()" disabled />

            </div>      

        <?php
            if (isset($_POST['submit']) && $_POST['submit']!='') {
                if(isset($_POST['radio'])) {
                    $image = $_POST['radio'];
                    increaseClicks($image);
                    $x = $x+2;          
                }

                $_SESSION['image_nr'] = $x;
                $next = getNext($image);
                echo '<script type="text/javascript">'
                    , 'changeImage('.$next.');'
                    , '</script>'

                ;
                $_POST['submit']='';
            }
        ?>
        </form> 
    </body>
</html>

这是JS函数：

function enableButton(){
        document.getElementById("button").disabled = false;
}


function changeImage(next){


    var firstpart = "<img src='images/image_";
    var secondpart = ".jpg' width='380'><br>Bild"+next;
    var inHtml = firstpart.concat(next, secondpart);
    document.getElementById("bild1").innerHTML = inHtml;
    var secondpart = ".jpg' width='380'><br>Bild"+(next+1);
    var inHtml = firstpart.concat((next+1), secondpart);
    document.getElementById("bild2").innerHTML = inHtml;

}

查询（我知道这些已被弃用）

<?php

function getClicks ($image){

    $q1 = "SELECT clicks from tbl_clicks WHERE ID_bild=".$image;
    $rq1 = mysql_query($q1);
    $return = mysql_fetch_array($rq1);
    $number_of_clicks = $return['clicks'];
    return $number_of_clicks;
}


function getClicksAll (){
    $q1 = "SELECT ID_bild, name, clicks from tbl_clicks";
    $rq1 = mysql_query($q1);
    return $rq1;
}

function increaseClicks ($image){

    $clicks = getClicks($image);
    $clicks = (int)$clicks;
    $clicks = $clicks + 1;
    echo "this are the clicks: ".$clicks;
    $q2 = "UPDATE tbl_clicks SET clicks = ".$clicks." WHERE ID_bild = ".$image;
    mysql_query ($q2);
}

function getNext ($image){

    $q3 = "SELECT next from tbl_clicks WHERE ID_bild=".$image;
    $rq3 = mysql_query($q3);
    $return = mysql_fetch_array($rq3);
    $next = $return['next'];    
    return $next;

}

function getParticipants(){

    $q4 = "SELECT participants from tbl_participants";
    $rq4 = mysql_query($q4);
    $return = mysql_fetch_array($rq4);
    $participants = $return['participants'];
    return $participants;
}

function increaseParticipants(){
    $participants = getParticipants();
    $q5 = "UPDATE tbl_participants SET participants = ".($participants+1);
    mysql_query ($q5);
}

?>

PHP：会话变量在第一次迭代中不会增加

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