Question

如果我这样做

include('orderConst_pdo_connect.php');
switch  ($type){
    case "retrieve":
        retrieve_address($customer_id);
        break;
    case "new":
        new_address($customer_id, $address);
        break;
    case "update":
        update_address($customer_id, $address_id);
        break;
    case "delete":
        delete_address($customer_id, $address_id);
        break;              
}

function retrieve_address($customer_id){
    $sth = $dbh->prepare("
    SELECT * 
    FROM   address 
    WHERE  customer_id = :customer_id 
    ORDER  BY CASE 
                WHEN use_frequency IS NULL THEN id 
                ELSE use_frequency 
              END ASC");

.... 

}

我收到错误

Fatal error: Call to a member function prepare() on a non-object

直到我把include('orderConst_pdo_connect.php')放在函数中。有没有办法在页面顶部包含文件并让函数访问它，或者我是否需要将它包含在每个使用它的函数中？

Answer 1

默认情况下，在包含文件中定义的变量在函数内部不可用。您可以使用global $dbh

授予您对该变量的函数访问权限

Answer 2

而不是使用global，只需执行：

function retrieve_address($dbh, $customer_id) {
    // blah
}

include（）一个文件，所以每个函数都有访问权限

2 个答案: