Customized HRM web application

Hi, I am looking for a human resource management web application. Currently, the process is manual. Heres a list of functions that should be performed by the system. 1> Maintain employee records 2> Employee self service (employees should be able to update their info) 3> User levels - HR - HOD - Manager - Employees 4> Leave management - Allocate leave for an year - Employees can apply for leave - HR managers can approve/reject leave applications - Employees can view their leave applications status 5> Attendance - For every single day, the employees can punch in time and punch out time. - The time should not be editable, it should be got from the system its running on. - If they are out of the office for some official work, the system should provide an option to regularize attendance (the user fills a forms and submits which can be approved/rejected by HR) 6> Reports - HR managers should be able to generate weekly, monthly, yearly reports of attendance, leaves taken, remaining leaves etc (pdf format) - Employees should be able to generate reports to check their attendance / leaves. 7> Pay Grade - HR manager can set pay grade for every employee. 8> CTC - Depending on the pay grade, the employee fills up CTC (cost to the company). The application should make sure, the value of CTC doesnt exceed 60% of his/her pay. 9> Travel - Employee needs to travel for official work. In this case, the employee can fill a travel request form. This request can again be approved/ rejected by HR. If approved, the attendance for that period, should be marked present. The employee can view his travel request status. The preferred platform is PHP/MySQL. Customizing an open source application is preferred.