How to invoke a variable outside the class

How to call variables outside the class
This post was last edited by Hicoo on 2014-06-07 10:21:04

a.php page is a data link variable
$dbhost = "localhost";
$dbname = "FFFF";
$dbuser = "CCCC";
$dbpwd = "123456";
$dbprefix = "User";
$db _language = "GBK";

B.php the operation functions of various databases in the page class
Require_once (".. /data/a.php ");
Class mydatabase{

Link Database
function OpenData ($database) {
In this method, how to get the variables outside the class
}


Query a record
function Readone ($database) {
Self::opendata ($database);
$rs = mysql_query ("SELECT * from FCC where id=1");
$row = Mysql_fetch_array ($RS);
Self::closedata ();
return $row ["Date"];
}

}
------Solution--------------------
Link Database
function OpenData ($database) {
　　 include (".. /data/a.php ");
}

or defined as constants

You are outside the class definition require_once (".. /data/a.php ")
Causes database-related parameters to become global variables and may overwrite variables with the same name
It can also be easily observed by $GLOBALS arrays.
------Solution--------------------
You need to see the basics.

Require_once (".. /data/a.php ");

Class MyDatabase {

    Link Database
    function OpenData ($database) {
        Method One
        Global $dbhost, $dbname, $dbuser, $dbpwd, $dbprefix, $db _language;
        Method Two
        Require_once (".. /data/a.php ");
        Method Three
        Define all variables as constants in a.php
        Define (' Db_host ', ' test ');
        Direct use of db_host when calling
        Echo db_host;
        
    }


    Query a record
    function Readone ($database) {
        Self::opendata ($database);
        $rs = mysql_query ("SELECT * from FCC where id=1");
        $row = Mysql_fetch_array ($RS);
        Self::closedata ();
        return $row ["Date"];
        
    }

}

------Solution--------------------
It is recommended that the variables of the a.php be written in the same array, or changed into function and return
Naming pollution is sometimes disgusting.
------Solution--------------------
Generally these configuration information is best to become constant
------Solution--------------------
Reference:

Thank you for the above two masters, and then I would like to put the code to get the variable in the constructor can be, because I will also use in other methods of some variables, it is not to be quoted again, but how many variables of the constructor return (return)?
Class mydatabase{
Private $myhost;
Private $myuser;
Private $mypwd;

Public Function __construct () {
Require_once (".. /data/a.php ");
$this->myhost= $dbhost;
$this->myuser= $dbuser;
$this->mypwd= $dbpwd;
return $this->myhost;
Can you tell me how many variables are returned, and if there is no return, the other method cannot get
Echo $dbhost;
}

function OpenData ($database) {
$this->__construct ();
$linkid = mysql_connect ($this->myhost, $this->myuser, $this->mypwd);
}

}

The first method, with constants, can be used everywhere.
.. /data/a.php

 
      Define (' MYHOST ', ' localhost ');
    Define (' MYUSER ', ' CCCC ');
    Define (' MyPwd ', ' 123456 ');
?>

 
  Require_once (".. /data/a.php ");

Class mydatabase{

    Private $myhost;
    Private $myuser;
    Private $mypwd;

    Public Function __construct () {
        $this->myhost = myhost;
        $this->myuser = myuser;
        $this->mypwd = MyPwd;
    }

    function OpenData ($database) {
        $linkid = mysql_connect ($this->myhost, $this->myuser, $this->mypwd);
    }

}
?>

the second, with the config array
.. /data/a.php

 
  Return Array (
    ' myhost ' = ' localhost ',
    ' MyUser ' = ' CCCC ',
    ' MyPwd ' = ' 123456 '
);

 
  Class mydatabase{
