// 失物发布
<?php
if(isset($_POST['submit_lost_item'])) {
    $item_name = $_POST['item_name'];
    $description = $_POST['description'];
    
    // 将失物信息插入失物信息表中
    $stmt = $pdo->prepare("INSERT INTO lost_items (item_name, description, user_id) VALUES (:item_name, :description, :user_id)");
    $stmt->bindParam(':item_name', $item_name);
    $stmt->bindParam(':description', $description);
    $stmt->bindParam(':user_id', $_SESSION['user_id']);
    
    if($stmt->execute()) {
        echo "失物发布成功";
    } else {
        echo "失物发布失败";
    }
}
?>

// 失物查询
<?php
$stmt = $pdo->prepare("SELECT * FROM lost_items WHERE user_id = :user_id");
$stmt->bindParam(':user_id', $_SESSION['user_id']);
$stmt->execute();
$lost_items = $stmt->fetchAll();

foreach($lost_items as $item) {
    echo $item['item_name'] . ": " . $item['description'] . "<br>";
}
?>