PHP类数据库连接

Question

I have a class which I'll like to include couple db routines instead of inline.

class Classica{

public $dbhost;
public $dbname;
public $dbuser;
public $dbpass;


__function construct(){
    //hook connectdb() upon contruct.
}

#connect to database
    public function connectdb($dbhost,$dbname,$dbuser,$dbpass){        

        $link = mysql_connect($dbhost,$dbuser,$dbpass);
        if (!$link) {
          die('Could not connect: ' . mysql_error());
        }else {
            //echo 'Connected Successfully to Database<br>';
        }
        @mysql_select_db($dbname) or die( "Unable to select database");
    } 

    #read database
    function readdb(){        
    }    
    #update database
    private function updatedb(){        
    }
    #close database connection
    function closedb(){
        mysql_close();    
    }

}

config.php

$dbhost = 'localhost';
$dbname = 'dem';
$dbuser = 'root';
$dbpass = '';

index.php

<?php
error_reporting(E_ALL ^ E_WARNING ^ E_NOTICE);
session_start();
include('config.php');
include('classica.php');
$obj = new classica();

?>

The database connection details I will like to maintain on a separate config file which is included on document load.

The problems I'm having:

Retrieving database config values inside the class. Trying to attach a separate database class to separate from parent.

Any suggestions of approach and/or solution.

Answer 1

You can set the config variables in the global scope

public function __construct()
{
    global $dbhost, $dbname, etc... ;
    $this->connectdb($dbhost, $dbname, etc...);

Or use constants , its scope is global:

config.php

define('MYAPP_DBHOST', 'localhost');
define('MYAPP_DBNAME', 'dem');

and in your class:

public function __construct()
{
    $this->connectdb(MYAPP_DBHOST, MYAPP_DBNAME, etc...);

Answer 2

The simplest method would be do include('config.php') inside the connectdb function (or the function calling it). When you include a PHP file (remember to include <?php open tag!), the variables will become declared within the scope of the function doing the inclusion. So for example, __construct() (note that you have a typo) may be:

function __construct() {
    include('config.php');
    $this->connectdb($dbhost,$dbname,$dbuser,$dbpass);
}

Answer 3

Are you asking how to read from a config file? Try 'parse_ini_file'. http://php.net/manual/en/function.parse-ini-file.php