How do we calculate monthly sale in codeigniter? - php

Question

I have trouble with some calculation in Codeigniter. Please check attached image below
https://imgur.com/HuSBkXJ
That data fetching from the database , the sale column is fine but I having trouble with monthly sale
1st day of every month sale (10) and monthly sale (10) are same, but from second day sale is correct(8), monthly sale has to be 1st day sale + second day sale(10+8 = 18). for third day sale is fine, monthly sale should be (18+20=38). the calculation going like this up to end of the month, Same process again stating from next month
How do we calculate in codeigniter, The above image i have created in excel sheet for demonstration purpose.
Model view
public function fetchSaleData()
{
$this->db->join('stock_shop','stock_shop.shop_id = stock_sale.shopId');
$this->db->join('stock_products','stock_products.product_id = stock_sale.productID');
$thisMonth=date('m');
$this->db->where('MONTH(DateOfSale)',$thisMonth);
$query= $this->db->get("stock_sale");
return $query->result_array();
}
controller view
public function salesView()
{
$data['sales']=$this->Query_sale->fetchSaleData();
$data['shops']=$this->Query_sale->fetchShop();
$this->load->view('stock/shop_sales_view',$data);
}

Answer 1

since you're not showing table structures or any other insight, I'll only suggest an approach based on my own code which you may feel free to adapt to your specific needs, along with the assumptions I make along the way
Assumption #1: the model returns an array in which each element contains the date and the sold units on such date
This would look like this
+-----------------+
| array data |
+------------+----+
| 2020-01-01 | 10 |
+------------+----+
| 2020-01-02 | 20 |
+------------+----+
| 2020-01-03 | 5 |
+------------+----+
| 2020-01-04 | 8 |
+------------+----+
On array form, this may look like this:
$ar = array(
0 => array(
'date' => '2020-01-01',
'units_sold' => 10,
),
1 => array(
'date' => '2020-01-02',
'units_sold' => 20,
),
2 => array(
'date' => '2020-01-03',
'units_sold' => 5,
),
3 => array(
'date' => '2020-01-04',
'units_sold' => 8,
),
);
and so on until the end of the month. Lets call the returned fields date and units_sold as in the above example
now that you have the data loaded in a variable ($ar) you can loop through it and keep tabs on the accumulated total on each loop.
$accum = 0; // keep track of accumulated total
$i = 0; // keep track of array index
foreach ($ar as $a)
{
$accum += $a['sales'];
$ar[$i]['accum'] = $accum;
$i++;
}
Upon running, this code will:
Iteration 0: For 2020-01-01, sales=10, accumulated=10
Iteration 1: For 2020-01-02, sales 20, accumulated=30
Iteration 2: For 2020-01-03, sales 5, accumulated=35
...and so on until the month is over
The above can be verified with a print_r or var_dump (I use print_r... like this: print print_r($ar,true);):
print_r output
Array
(
[0] => Array
(
[date] => 2020-01-01
[sales] => 10
[accum] => 10
)
[1] => Array
(
[date] => 2020-01-02
[sales] => 20
[accum] => 30
)
[2] => Array
(
[date] => 2020-01-03
[sales] => 5
[accum] => 35
)
[3] => Array
(
[date] => 2020-01-04
[sales] => 8
[accum] => 43
)
)
So, now that you've succesfully pushed a whole new element in your result array, you can send it over to the view and display it in tabular form as you need