Question

好的，我有1个html页面设置HTML multiple Attribute from。这是它的设置方式：

<!DOCTYPE html>
<html>
<body>
<form action = "otherpage.php" method= "post"> 
    <select name = "cars[]" multiple="multiple" size="4"> 
      <option value="volvo">Volvo</option>
      <option value="saab">Saab</option>
      <option value="opel">Opel</option>
      <option value="audi">Audi</option>
    </select> 
    <button type = "submit" value= "Submit">Submit</button> 
    <button type = "reset" value= "Clear">Clear</button>
</form>
</body>
</html>

我有第二个php页面，我们称之为＆＃34; otherpage.php＆＃34;这就是它的设置方式：

<!DOCTYPE html>
<html>
<body>
   <form action = "" method= "post">
   Name:  <input type = "text" name = "yourname" />
   <button type = "submit" value= "Submit2">Submit</button>
   <input type="hidden" name="f" value=<?php $cars= array(); $cars= $_POST['cars']; print_r($cars); ?> />
   <?php
   if(isset($_POST['f'])) {echo ($_POST['f']);}
   ?>
</body>
</html>

当我在第一个html页面上点击第一个提交时，阵列打印出来就很好了。然后，当我再次点击另一个提交＆＃34; otherpage.php＆＃34;时，该数组不再存在，我收到错误。无论我在otherpage.php上提交了多少次，我怎样才能让汽车阵列永远保留？

Answer 1

最简单的方法是将数据存储在会话变量中。

您必须在要使用它的每个文件的顶部安装session_start（）。

然后当你得到$ _POST值时：

$_SESSION['post'] = $_POST;

之后，您可以在任何其他文件上执行您想要的操作。

Answer 2

你需要将数组内联到字符串并再次爆炸以获取数组或将其编码为json字符串并重新编码它以任何方式工作

<?php 
$cars = isset($_POST['cars']) ?
$_POST['cars'] : isset($_POST['f']) ? explode(',',$_POST['f']) : [];
?>
DOCTYPE html>
<html>
<body>
   <form action = "" method= "post">
   Name:  <input type = "text" name = "yourname" />
   <button type = "submit" value= "Submit2">Submit</button>
   <input type="hidden" name="f" value="<?php echo implode(',', $cars)?>"/>
</body>
</html>

Answer 3

我知道你已经接受了答案，但放弃我的测试而不向你展示我的版本也是很小的。

echo '<pre>'...仅用于显示结果。请注意使用value="<?php echo print_r($cars, true); ?>"。

<?php
if (isset($_POST['cars'])) {
    $cars = $_POST['cars'];
} elseif (isset($_POST['f'])) {
    $cars = $_POST['f'];
} else {
    $cars = array();
}

echo '<pre>' . print_r($cars, true) . '</pre>';
?>

<!DOCTYPE html>
<html>
    <body>
        <form action="" method="post">
            Name:  <input type="text" name="yourname" />
            <?php
            foreach ($cars as $car) {
                echo '<br/>' . $car . '<input type="radio" name="car" value="' . $car . '" />';
            }
            ?>
            <button type="submit" value="Submit2">Submit</button>
            <input type="hidden" name="f" value="<?php echo print_r($cars, true); ?>" />
        </form>
    </body>
</html>

祝你好运。

编辑2：使用会话

您不再需要隐藏输入。我也更改了页面名称和一些HTML。

Page cars_select.php：

<!DOCTYPE html>
<html>
    <head>
        <title>Cars selecting page</title>
    </head>
    <body>
        <form action="cars_list.php" method= "post"> 
            <select name = "cars[]" multiple="multiple" size="4"> 
                <option value="volvo">Volvo</option>
                <option value="saab">Saab</option>
                <option value="opel">Opel</option>
                <option value="audi">Audi</option>
            </select> 
            <button type="submit" id="selectSubmit" name="selectSubmit" value="Submit">
                Cars selected. List them!
            </button>
        </form>
    </body>
</html>

Page cars_list.php

<?php
session_start();

// Upon clicking on "selectSubmit" button.
if (isset($_POST['selectSubmit'])) {
    // Set POST received cars list as session variable.
    $_SESSION['cars'] = isset($_POST['cars']) ? $_POST['cars'] : array();

    echo 'Called by CARS SELECT page.';
}

// Upon clicking on "listSubmit" button.
if (isset($_POST['listSubmit'])) {
    echo 'Called by CARS LIST page.';
}

// Test display of SESSION array.
echo '<br/><br/>Session is: <pre>' . print_r($_SESSION, true) . '</pre>';

// Read cars list from session.
$cars = $_SESSION['cars'];
?>

<!DOCTYPE html>
<html>
    <head>
        <title>Cars listing page</title>
    </head>
    <body>
        <hr/>
        <form action="" method="post">
            Name:  <input type="text" name="yourname" />
            <?php
            foreach ($cars as $car) {
                echo '<br/>' . $car . '<input type="radio" name="car" value="' . $car . '" />';
            }
            ?>
            <button type="submit" id="listSubmit" name="listSubmit" value="Submit">Refresh page!</button>
        </form>
    </body>
</html>

使表单数据保持在PHP页面上的多选形式

3 个答案:

编辑2：使用会话

Page cars_select.php：

Page cars_list.php