i need to create a payroll management system using php

i need to create an employee payroll management system using php. this system should contain,
1Shift assigning for each employees 2. departments are- Reception, bar, cashier, kitchen,room boys, maintenance dept( no shifts-8-4) 3.create a salary sheet to every employee and it should contain, i) work days( every employee has 4 holidays by the order. if he get more than 4 holidays it should be deduct from their net salary) ii) OT hours iii) basic salary iv) allowance v)net salary but i don't know how to do? please help me to start this.

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