从函数返回数组时出现“未定义变量”错误

Question

Essentially, I have a message class with a function that can write to an array. I want to then return that instance of an array through a function when called.

This is the class:

class Message
{
    public $formMessages = array();

    public function __construct()
    {
    }

    public function writeFormMessage($field, $message)
    {
        $formMessages[$field] = $message;
    }

    public function getFormMessages()
    {
        return $this->formMessages;
    }
}

Here is how I am attempting to grab the formMessages array from another file. Yes I already have an instance of the Message class in said file.

$test = $message->getFormMessages();

It fails this predicate, though it doesn't seem to be seeing the array anyhow:

if (!empty($test))
{ 
}

The php error was 'Undefined variable: formMessages in C:\xampp\htdocs\test\classes\message.class.php on line 45'

Edit: Thanks all!

Answer 1

Look at this line in your writeFormMessage method:

$formMessages[$field] = $message;

That attempts to access a local variable. (Which doesn't exist within that method.)

Compare to this usage in getFormMessages() however:

return $this->formMessages;

There you are correctly accessing the intended property.

Use the same $this-> syntax for both.