Income tax calculation using different slabs in php - php

Question

I am trying to do a work on TAX CALCULATION using php.The required slabs or criterion for the tax calculation is based on AGE ,startincome and endincome . I am using CODEIGNITER framework.As I am new to this I have no idea on how to get the things done.
My code should contain only dynamic variables as the 'slabs' that are to be get from the Database and result should be produced based on the AGE and Salary given at random.
My view file is given below:tax.php
<form>
<table border="1" align="center" cellpadding="30">
<tr>
<td colspan="2" align="center">
<b>Tax calculation</b>
</td>
</tr>
<tr>
<td>
<label for="name"><b>Name</label>
</td>
<td>
<input id="name" name="name" type="textbox" placeholder="enter your name" size="30" >
</td>
</tr>
<tr>
<td>
<label for="name"><b>Age</label>
</td>
<td>
<input id="name" name="name" type="textbox"placeholder="enter your age" size="30" >
</td>
</tr>
<tr>
<td>
<label for=""><b>Salary:</label></td>
<td>
<input id="salary" name="phone" type="textbox"placeholder="enter your yearly salary" size="30" >
</tr>
<tr>
<td>
<div>
<input type="submit" value="calculate" name="submit" />
</div>
</td>
<td>
<label for=""><strong>Tax Amount:</strong></label>
<input id="Tax" name="tax" type="textbox" size="17" >
</td>
</table>
</form>
My controller code is below:Tax.php
<?php
class Tax extends CI_Controller
{
public function __construct()
{
parent::__construct();
$this->load->helper(array('form', 'url'));
$this->load->library('form_validation');
}
public function index()
{
$servername='localhost';
$username='root';
$password='';
$database='register';
$conn = mysqli_connect($servername,$username,$password);
$this->load->view('tax');
//$this->load->model(Taxmodel);
if(isset($_POST['submit']))
{
//echo"inside submit";
$this->form_validation->set_rules('name','Name','trim|required');
$this->form_validation->set_rules('age','Age','trim|required');
$this->form_validation->set_rules('salary','Salary','trim|required',array('required' => 'You must provide a %s.'));
//checks whether the validation returns true or false
if ($this->form_validation->run() ==TRUE)
{
//echo' validation check';
//storing data to Array
$userdata = array(
'Name' => $this->input->post('name'),
'Age' => $this->input->post('age'),
'Salary' => $this->input->post('salary')
);
print_r($userdata);
$this->load->model('Taxmodel');
//$this->Taxmodel->insertdata($userdata);
}
}
}
public function getresult()//to get database values in a row
{
echo "inside getresult";
$salary=$_POST['salary'];
$data= $this->db->query("SELECT * FROM `admin_income` WHERE age<".$age." and age in (SELECT max(age) FROM `admin_income` WHERE age<".$age." order by `age` desc) order by `age` desc ");
print_r($data);
$result=$conn->query($data);
Global $totaltax;
while ($row = mysql_fetch_assoc($result))
{echo "inside while1";
while($salary>= $row[$start_incom] && $salary< $row[$end_incom])
{
//echo"Inside tax calculation";
$diff=$salary-$startincome;
$tax=(($percentage/100)*$diff);
echo $tax;
}
echo $tax;
}
}
public function extamount()
{//to get the additional amount to be added
/*$query = $this->db->query("SELECT * FROM admin_income LIMIT 1;");
if ($query->num_rows() > 0)
{
$row = $query->next_row('array')*/
if($initial_income>$start_incom)//codnition for checking whether the salary exceeds first slab
{
$diffresult=$end_incom-$start_incom;
$adtntax=[($percentage/100)*$diffresult];
echo $adtntax;
}
$totaltax=$adtntax+$tax;
//}
}
}
?>
My model name is Taxmodel.php
Database Table
I am new to CodeIgniter. Help will be appreciated.

Answer 1

I have try this code and work for me you can take it as a reference. create range array like
$getTaxCharge = array(
array(
'amount_range_from' => 0,
'amount_range_to' => 250000,
'tax_percentage' => 0
),
array(
'amount_range_from' => 250001,
'amount_range_to' => 500000,
'tax_percentage' => 10
),
array(
'amount_range_from' => 500001,
'amount_range_to' => 1000000,
'tax_percentage' => 20
),
array(
'amount_range_from' => 1000001,
'amount_range_to' => 100000000000,
'tax_percentage' => 30
)
);
<?php
$getTaxCharge = array(
array(
'amount_range_from' => 0,
'amount_range_to' => 250000,
'tax_percentage' => 0,
),
array(
'amount_range_from' => 250001,
'amount_range_to' => 500000,
'tax_percentage' => 10,
),
array(
'amount_range_from' => 500001,
'amount_range_to' => 1000000,
'tax_percentage' =>20,
),
array(
'amount_range_from' => 1000001,
'amount_range_to' => 100000000000,
'tax_percentage' =>30,
)
);
$calculateTaxOnAmount = 900000;
$remainingAmount = $calculateTaxOnAmount;
$amount = $calculateTaxOnAmount;
$arrayAmount = array();
foreach ($getTaxCharge as $key => $value) {
$resultArray = array();
if ($calculateTaxOnAmount > $value['amount_range_to']) {
$sum = $value['amount_range_to'] - $value['amount_range_from'];
$resultArray['amount'] = $sum;
$resultArray['percentage'] = $value['tax_percentage'];
array_push($arrayAmount, $resultArray);
$remainingAmount = $remainingAmount - $sum;
} else {
$resultArray['amount'] = $remainingAmount;
$resultArray['percentage'] = $value['tax_percentage'];
array_push($arrayAmount, $resultArray);
break;
}
}
$resultantTaxAmount = 0;
foreach ($arrayAmount as $key => $value) {
$cal = (($value['amount'] * $value['percentage']) / 100);
$resultantTaxAmount = $resultantTaxAmount + $cal;
}
echo round($resultantTaxAmount);
?>