How can PHP developers effectively troubleshoot and resolve errors related to accessing functions and variables across different classes?

When troubleshooting errors related to accessing functions and variables across different classes in PHP, developers should ensure that the correct visibility keywords (public, private, protected) are used for methods and properties. They should also check for typos in the class names, method names, and variable names. Additionally, developers can use PHP's error reporting functions like error_reporting() and ini_set() to display any errors that may occur. 

class MyClass {
    private $myVariable;

    public function setVariable($value) {
        $this->myVariable = $value;
    }

    public function getVariable() {
        return $this->myVariable;
    }
}

$myObject = new MyClass();
$myObject->setVariable("Hello, World!");

echo $myObject->getVariable();

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