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class DBUtil {
function &instance() {
static $object;
if(empty($object)) {
$object = new DBUtil();
}
return $object;
}
function DBUtil(){
echo "DBUtil";
}
}
$dbUtil = DBUtil::instance();
class DBUtil2 {
private static $instance = null;
public static function getInstance() {
if (self::$instance == null) {
self::$instance = new DBUtil2();
}
return self::$instance;
}
function __construct(){
echo "DBUtil2";
}
}
$dbUtil2 = DBUtil2::getInstance();
<?php
class DBUtil2 {
private static $instance = null;
public static function getInstance() {
if (self::$instance == null) {
self::$instance = new DBUtil2();
}
return self::$instance;
}
function __construct(){
echo "DBUtil2";
}
}
$a = new DBUtil2();
$b = new DBUtil2();
$c = new DBUtil2();