global probleem

<?php
function __construct() {
$select = mysql_query("SELECT city FROM countries");
$arr = mysql_fetch_array($select);

global $arr;
}

function showCity() {
echo $arr['city'];
}
?>

<?php
function __construct() {
$select = mysql_query("SELECT city FROM countries");
$arr = mysql_fetch_array($select);
 
global $arr;
}
 
function showCity() {
echo $arr['city'];
}
?>

<?php
var $select;
var $arr;

function __construct() {
$this -> select = mysql_query("SELECT city FROM countries");
$this -> arr = mysql_fetch_array($select);
}

function showCity() {
echo $this -> arr['city'];
}
?>

<?php
var $select;
var $arr;
 
function __construct() {
$this -> select = mysql_query("SELECT city FROM countries");
$this -> arr = mysql_fetch_array($select);
}
 
function showCity() {
echo $this -> arr['city'];
}
?>

<?php
public $city;

function __construct() {
$select = mysql_query("SELECT city FROM countries");
if(mysql_num_rows($select) != 0) {
    while($r = mysql_fetch_array($select)) {
        $this->city = $r['city'];
    }
}

function showCity() {
    echo $this->city;
}
?>

<?php
public $city;
 
function __construct() {
$select = mysql_query("SELECT city FROM countries");
if(mysql_num_rows($select) != 0) {
    while($r = mysql_fetch_array($select)) {
        $this->city = $r['city'];
    }
}
 
function showCity() {
    echo $this->city;
}
?>