Question

我收到此错误：

"Warning: array_merge(): Argument #1 is not an array in 
  C:\xampp\htdocs\sam\arraysession.php on line 16"

但具有讽刺意味的是这个例子来自书中...... 并且没有输入错误，我检查了几次。有人可以给我一个提示吗？我真的很沮丧......

<?php 
session_start();
?>
<!DOCTYPE html>
<html>
<head>  
    <title>Storing an array with a session</title>
</head>
<body>
    <h1>Product choice page</h1>
    <?php
        if (isset($_POST['form_products'])) {
            if(!empty($_SESSION['products'])) {
                echo $_SESSION['products'];
                $products = array_unique(
                array_merge(unserialize($_SESSION['products']), $_POST['form_products']));
            } else {
                $_SESSION['products'] = $_POST['form_products'];
            }
        echo "<p>Your products have been registered!</p>";
        }
    ?>
    <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
        <p><label for="form_products">Select some products:</label><br>
        <select id="form_products" name="form_products[]" multiple="multiple"
        size = "3">
        <option value="Sonic Screwdriver">Sonic screwdriver</option>
        <option value="Hal 2000">Hal 2000</option>
        <option value="Tardis">Tardis</option>
        <option value="ORAC">ORAC</option>
        <option value="Transporter bracelet">Transporter bracelet</option>
        </select></p>
        <button type="submit" name="submit" value="choose">Submit form</button>
    </form>
    <p><a href="session1.php">go to content page</a></p>
</body>
</html>

$ _ SESSION ['products']包含

a:3:{i:0;s:17:"Sonic Screwdriver";i:1;s:8:"Hal 2000";i:2;s:6:"Tardis";}

var_dump $ _SESSION ['products']显示

string(71) "a:3:{i:0;s:17:"Sonic Screwdriver";i:1;s:8:"Hal 2000";i:2;s:6:"Tardis";}"

反序列化（$ _ SESSION [ '产品']）;包含

Array
(
    [0] => Sonic Screwdriver
    [1] => Hal 2000
    [2] => Tardis
)

Answer 1

当您对$_SESSION['products']进行反序列化时，它应该包含一个字符串。因此，当您将值存储到其中时，请存储已发布数组的已筛选形式。

你必须这样做

if (isset($_POST['form_products'])) {
    if(!empty($_SESSION['products'])) {
        $products = array_unique(
        array_merge(unserialize($_SESSION['products']), $_POST['form_products']));
        $_SESSION['products'] = serialize($products);
    } else {
        $_SESSION['products'] = serialize($_POST['form_products']);
    }
    echo "<p>Your products have been registered!</p>";
}

Array_merge（） - 尝试反序列化会话变量作为第一个参数抛出错误

1 个答案: