Magento 2 : Check if method exist in class

Question

I am getting below error

Magento 2 : Call to a member function getCustomerIsGuest() on null error

on Magento\CustomerBalance\Model\Balance class

In local environment on protected function _ensureCustomer() method i get order data by $this->getOrder() but in live it causes error, i am not sure if $this->getOrder() method exist for this class and in _ensureCustomer() method.

Any advice or thoughts ?

Answer 1

class A{
    public function foo(){
        echo "foo";
    }

    public function bar(){
        if(method_exists($this, 'foo')){
            echo "method exists";
        }else{
            echo "method does not exist";
        }
    }
}

$obj = new A;
$obj->bar();

but in your case the method or function you are passing on an object is Null. Wrap it to is_null($oject)

Might this help you