Uncaught error with a function within a class - php

Question

There must be some misunderstanding with my implementation of the function $get_ship_class -> check_array($category,$cat_in_class = array()); because it's throwing the error:
Fatal error: Uncaught ArgumentCountError: Too few arguments to
function get_ship_class::check_array(), 0 passed in
C:\xampp\htdocs\php_sandbox\assign_ship_class.php on line 60 and at
least 1 expected in
C:\xampp\htdocs\php_sandbox\assign_ship_class.php:45 Stack trace: #0
C:\xampp\htdocs\php_sandbox\assign_ship_class.php(60):
get_ship_class->check_array() #1 {main} thrown in
C:\xampp\htdocs\php_sandbox\assign_ship_class.php on line 45
in response, I tried $get_ship_class->check_array($category, $cat_in_class = array()) and it didn't work.
Essentially the first function get_class_categories() retrieves the product categories under a specific shipping class as an array.
function get_product_category($category) retrieves the category of the current product at hand - we will pretend; set $category = "Monitors" in this case.
Lastly check_array(); just checks if $category = Monitors matches any elements in the list of categories for this shipping class, which was generated by the get_class_categories() function.
<?php
class get_ship_class
{
public function get_class_categories()
{
$csv = array_map("str_getcsv", file("Shipping Classes.csv"));
/*
print_r($csv);
echo "<br />";
*/
$header = array_shift($csv);
// Separate the header from data
/*
print_r($header);
echo "<br />";
*/
$col = array_search("Com1_34-95", $header);
/*
print_r($col);
*/
foreach ($csv as $row) {
$array[] = $row[$col];
}
$cat_in_class = array_filter($array);
print_r($cat_in_class);
//https://stackoverflow.com/a/30909191/9095603
$this->check_array($cat_in_class); // pass array onto function below
}
public function get_product_category()
{
$this->category = 'Monitor';
//echo $this->category;
}
public function check_array($category, $cat_in_class = array())
{
// https://stackoverflow.com/a/6431836/9095603
//$this->category='Monitor';
$this->category;
if (in_array($this->category, $cat_in_class)) {
echo "Match detected!";
}
}
}
$get_ship_class = new get_ship_class();
$get_ship_class->get_product_category('Monitors');
//echo '<br />';
$get_ship_class->get_class_categories();
//echo '<br />';
$get_ship_class->check_array();

Answer 1

I agree with #u_mulder. Regardless, I'm trying to give you an answer.
Your code calls the check_array function twice:
At the end of the get_class_categories function, handing over exactly one argument: $cat_in_class - not TWO
At the end of your php file, handing over null arguments.
I suggest you to perform a code review. Once you have identified the control flow, you should be able to fix it. (Please let getXX functions return a value, if they don't name they setXX and let they write their results to object variables...)