Question

我有一个包含动物的阵列。我使用foreach循环打印出数组。我想更新特定键的值，而不更改具有不同键的任何其他值。我在每个键旁边都有一个更新输入框，用于输入值。例如，当我键入键0的值时，所有其他键值也会改变，而不仅仅是0

所以我的输出是这样的：

The value of $_SESSION['0'] is 'cat'          // i want to change cat to something else
The value of $_SESSION['1'] is 'dog'          // dog to something else
The value of $_SESSION['2'] is 'mouse'        /mouse to something else

这是我的代码而且令人沮丧，因为我在foreach循环中为每个输入添加了$ key ...

**code 
    <?php
// begin the session
session_start();

// create an array
$my_array=array('cat', 'dog', 'mouse', 'bird', 'crocodile', 'wombat', 'koala', 'kangaroo');

// put the array in a session variable
$_SESSION['animals']=$my_array;





// loop through the session array with foreach
foreach($_SESSION['animals'] as $key=>$value)
{   

 // and print out the values
echo 'The value of $_SESSION['."'".$key."'".'] is '."'".$value."'".' <br />';


// getting the updated value from input box
if (isset($_POST["submit"])) {
        $aaa = $_POST['aaa'];


// setting the session spesific session array value different for each key  
 $_SESSION['animals'][$key] = $aaa;
}
    ?>
<form method="post" action="testthis.php">

<input type="text" name="aaa" value="<?php echo $value ; ?>" size="2" />
<input type="submit" value="Add to cart" name="submit"/></div>

</form>
    <?php

}
echo"<br/>---------------------------------------------------------<br/>";
//echoing out the results again for the updated version
foreach($_SESSION['animals'] as $key=>$value)
{ 

// and print out the values
echo 'The value of $_SESSION['."'".$key."'".'] is '."'".$value."'".' <br />';

}

?>

Answer 1

请尝试以下代码。

编辑：

1）将isset($_POST["submit"])移到foreach循环之外，这样它就不会更新所有会话。

2）使用要更新的key值的隐藏输入，以便我们只关注一个要更新的键。

 <?php
    // begin the session
    session_start();

    // create an array
    $my_array=array('cat', 'dog', 'mouse', 'bird', 'crocodile', 'wombat', 'koala', 'kangaroo');

    // put the array in a session variable
    if(!isset($_SESSION['animals']))
        $_SESSION['animals']=$my_array;

    // move submit code outside of foreach loop
    if (isset($_POST["submit"])) 
    {
        $aaa = $_POST['aaa'];
        $key_var = $_POST['ke'];

        // setting the session spesific session array value different for each key  
        $_SESSION['animals'][$key_var] = $aaa;
    }



    // loop through the session array with foreach
    foreach($_SESSION['animals'] as $key=>$value)
    {   

        // and print out the values
        echo 'The value of $_SESSION['."'".$key."'".'] is '."'".$value."'".' <br />';

        // getting the updated value from input box
        ?>
        <form method="post" action="">
            <input type="text" name="aaa" value="<?php echo $value ; ?>" size="2" />
            <!-- take a hidden input with value of key -->
            <input type="hidden" name="ke" value="<?php echo $key; ?>">
            <input type="submit" value="Add to cart" name="submit"/></div>
        </form>
        <?php
    }

    echo"<br/>---------------------------------------------------------<br/>";
    //echoing out the results again for the updated version
    foreach($_SESSION['animals'] as $key=>$value)
    { 
        // and print out the values
        echo 'The value of $_SESSION['."'".$key."'".'] is '."'".$value."'".' <br />';
    }
?>

更新特定键

1 个答案: