我正在为我正在开展的项目建立一个网站。我想在一个单独的文件中初始化一个名为PDOConfig的类,该文件用数据库详细信息填充数组。但是我收到一条错误,说找不到类PDOConfig。为了更好地理解我在这里的意思,有问题的页面是:
的index.php
<?php
// Start the output buffer and start the session
ob_start();
session_start();
// init.php will include all the required core libraries
include_once('includes/scripts/php/init.php');
?>
<!-- html code -->
<?php
ob_end_flush();
?>
包括/脚本/ PHP /的init.php
<?php
// init.php
// This file includes all the core libraries and, if required, customer and admin libraries.
#TODO: Include core libraries
require('libCore/vars.php');
require('libCore/db.php');
require('libCore/pages.php');
require('libCore/catalogue.php');
#TODO: Check if customer has logged in. If so include customer libraries.
#TODO: Check if a member of staff has logged in. If so include admin libraries.
#TODO: Log File Variables
$dblogfile = logs/db_log.txt';
?>
包括/脚本/ PHP / libCore / vars.php
<?php
// vars.php
// This file contains all of the site variables.
# Database Variables
$db_conf = new PDOConfig();
$db_conf->write('dsn.host', 'localhost');
$db_conf->write('db.username', '/*Username Here*/');
$db_conf->write('db.password', '/*Password Here*/');
$db_conf->write('dsn.dbname', 'A1Newsagents');
$db_conf->write('dsn.driver', 'sqlsrv');
$db_conf->write('dsn.charset', 'utf8');
#TODO: Form Variables
#TODO: Page Title Variables
?>
包括/脚本/ PHP / libCore / db.php中
<?php
// libCore/db.php
// This file contains all of the classes and functions required for database interaction.
class PDOConfig
{
// This class sets up an array that stores the configuration for the DSN and db username/password
static $confarray;
public static function read($conf_name)
{
return self::$confarray[$conf_name];
}
public static function write($conf_name, $conf_value)
{
self::$confarray[$conf_name] = $conf_value;
}
}
class DBCore
{
// This class sets up the database connection and controls database functionality
public $dbc;
private static $dbinst;
private function __construct()
{
// Build DSN
$dsn = PDOConfig::read('dsn.driver') . ':Server=' . PDOConfig::read('dsn.host') . ';Database=' . PDOConfig::read('dsn.dbname');
// Get db username and password
$dbuser = PDOConfig::read('db.username');
$dbpass = PDOConfig::read('db.password');
// Set the error mode to EXCEPTION, turn off PREPARE EMULATION and set the fetch mode to FETCH_ASSOC
$dbopts = array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_EMULATE_PREPARES => false, PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC);
// Start a new databse connection instance
$this->dbc = new PDO($dsn, $dbuser, $dbpass/*, $dbopts*/);
}
public static function DBInstance()
{
if (!isset(self::$dbinst))
{
$dbobject = __CLASS__;
self::$dbinst = new $dbobject;
}
return self::$dbinst;
}
}
?>
有没有办法让这项工作无需在每个文件中包含db.php?我已经看到了一些关于使用称为“命名空间”的东西来做这件事但是我认为我需要首先更好地掌握课程,因为我仍然非常业余。感谢
答案 0 :(得分:1)
听起来问题就在于您使用多个PHP include()
/ require()
的方式,指向错误的文件夹。当您使用这些功能中的任何一个时,您包含的文件基本上都是&#39; copy&#39;将它们的内容放入包含它们的文件中。
首先,您将includes/scripts/php/init.php
加入index.php
。
init.php
的内容基本上写入index.php
。因此,当您使用require('libCore/vars.php');
(init.php
内)时,require()
相对于 index.php (不是init.php
)。由于index.php
位于根目录,因此require()
会查找[ROOT]/libCore/vars.php
,而不是[ROOT]/includes/scripts/php/libCore/vars.php
。
要解决此问题,您应该从includes/scripts/php/init.php
提出require()
includes/scripts/php/
,或者更好的是,使用 root-relative 网址(请注意前导反斜杠):
`require('/libCore/vars.php');`
希望这有帮助! :)