班级：
if( ! class_exists('MY_CLASS') ) :
class MY_CLASS {
private static $_instance = null;
private static $counter = 0;
private function __construct() {
self::$counter++;
// Do stuff here.
echo "instances: " . self::$counter . "<br>";
}
// Other functions here
public static function instance() {
if ( is_null( self::$_instance ) ) {
self::$_instance = new MY_CLASS();
}
return self::$_instance;
}
}
function ctp() {
return MY_CLASS::instance();
}
// initialize
ctp();
endif; // class_exists check
$ counter始终为2。我已经检查过，并且函数instance()两次输入if条件is_null( self::$_instance )。
真的不能使此类仅被实例一次。请帮忙。
答案 0 :(得分：0)
对不起，找到导致问题的原因。
所以在6.0中，我有：
My_Class在second-class.php中，我有
function includes() {
require_once( 'path-to-second-class.php' );
// several other requires
}
private function init() {
// various class instantiations « new Class_Name() », but not for Second_Class
}
由于我不知道的某些原因，它不起作用，所以我将其更改为：
class Second_Class {
$taxs = array();
function __construct() {
$this->taxs = ctp()->get_ctp_taxs(); // which returns Main_Class->$taxs
// do other stuff
}
function do_stuff() {
foreach( $this->taxs as $tax_name => $tax_object ) {
// do stuff
}
}
}
new Second_Class();
：
My_Class然后在second-class.php中，我有了：
function includes() {
require_once( 'path-to-second-class.php' );
// several other requires
}
private function init() {
// same other instantiations
new Second_Class();
}