Question

我在3个PHP文件中有一些require“链”。 index.php需要db_get.php，这需要db_cred.php。所有这些都在相同的目录中。这些是代码：

的index.php

<?php
require 'db_get.php';
$db = getDatabase();
var_dump($db);
?>

db_get.php

<?php
require 'db_cred.php';

function getDatabase()
{
    $host = 'localhost';
    $database = $db_name;
    $username = $db_user;
    $password = $db_pass;

    $connectionString = 'mysql:host=' . $host . '; dbname=' . $database . '';
    $attributes = array(
        \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION, 
        \PDO::ATTR_PERSISTENT => false, 
        \PDO::MYSQL_ATTR_INIT_COMMAND => 'set names utf8mb4'
    );
    return new \PDO( $connectionString, $username, $password, $attributes);
}
?>

db_cred.php （此文件由另一个PHP文件自动生成）

<?php $db_name="testdb"; $db_user="qNOSdZ"; $db_pass="cAHk8A"; ?>

我从 index.php 获得的错误：

Notice: Undefined variable: db_name in C:\xampp\htdocs\sipil\me\db\db_get.php on line 7
Notice: Undefined variable: db_user in C:\xampp\htdocs\sipil\me\db\db_get.php on line 8
Notice: Undefined variable: db_pass in C:\xampp\htdocs\sipil\me\db\db_get.php on line 9

为什么我会收到这些错误？所有这些文件都在同一个目录中.. 我可能是愚蠢的，这个问题花了我一段时间，请帮助。

Answer 1

如上述评论所述，解决方案应该是：

<?php
require 'db_cred.php';

function getDatabase()
{
    global $db_name, $db_user, $db_pass;
    $host = 'localhost';
    $database = $db_name;
    $username = $db_user;
    $password = $db_pass;

    $connectionString = 'mysql:host=' . $host . '; dbname=' . $database . '';
    $attributes = array(
        \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION, 
        \PDO::ATTR_PERSISTENT => false, 
        \PDO::MYSQL_ATTR_INIT_COMMAND => 'set names utf8mb4'
    );
    return new \PDO( $connectionString, $username, $password, $attributes);
}
?>

Answer 2

function getDatabase()
{

    global $db_name;
    global $db_user;
    global $db_pass;

    $host = 'localhost';
    $database = $db_name;
    $username = $db_user;
    $password = $db_pass;

    $connectionString = 'mysql:host=' . $host . '; dbname=' . $database . '';
    $attributes = array(
        \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION, 
        \PDO::ATTR_PERSISTENT => false, 
        \PDO::MYSQL_ATTR_INIT_COMMAND => 'set names utf8mb4'
    );
    return new \PDO( $connectionString, $username, $password, $attributes);
}

要求所需文件中的文件不起作用

2 个答案: