nonces in custom oop plugin

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How to use the check_admin_referer method with oop?
If I use as it follows the function can not be called: 

class MyClass{
    function __construct(){ 

        if( isset($_POST['my_nonce_field']) && check_admin_referer('my_nonce_action', 'my_nonce_field')){               
            $this->update_item();
        }

    }
}

$test = new MyClass();

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The above leads to the following error message: 

Call to undefined function check_admin_referer()
Post Views: 2

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1 comment

  1. check_admin_referer is a pluggable function which means it is defined after plugins are loaded so call your constructor or instantiate the object after or using plugins_loaded action hook.

    ex:

    class MyClass{
    function __construct(){ 
        if( isset($_POST['my_nonce_field']) && check_admin_referer('my_nonce_action', 'my_nonce_field'))
            $this->update_item();
    }
}

add_action('plugins_loaded','newobj');
function newobj(){
    $myclass = new MyClass;
}