Laravel中的Carbon - 在整数上调用成员函数addDay（）

Question

I'm trying to build a scheduler in which an incremental day addition and subtraction method is required.

Here, I am simply trying to add a day to this variable (which is displayed to the user elsewhere) each time this function is executed via a button I set up that routes to a certain location. But, I keep getting this error

Call to a member function addDay() on integer

whenever I try to execute this. I am new to using the Carbon interface and looked through the documents, which led me to try parsing the function (worked when I had the same error with a string) but to no avail obviously. Any help is appreciated and/or a possible explanation of how this error is working really.

function addDay(){
$day = (int) Carbon::now()->format('j');
$day = $day->addDay();
}

Thanks in advance. If there is a better way to do this (adding days incrementally with the button/link), I would love to hear it. My logic seems flawed after working on the application the entire day.

Answer 1

You're casting the Carbon date object into an integer by using the (int) in the first $day variable. Therefor when you're trying to access the function addDay() it's failing, because $day is no longer a Carbon object but an integer.

$day = Carbon::now();
$day = $day->addDay()->format('j');

This should work, and if you need to cast it to an integer for some reason, then do it like this.

$day = Carbon::now();
$day = (int) $day->addDay()->format('j');

This way you cast the integer after you've added the day.

There is also a much cleaner approach to this syntax, which uses method chaining like so

$day = (int) Carbon::now()->addDay()->format('j');