Here is PHP code to:
1) Read / Scan any directory
2) Read any file
3) Write to any file
1) Read or Scan directory
Get all files and folders inside the directory.
Three ways are shown below.

Here is a quick guide on calculating inverter and battery backup time.
There are different capacity of inverters like 200VA, 250VA, 350VA, 400VA, 450VA, 500VA, 625VA, 1200VA, etc. The capacity of the inverter should be chosen based on how much watt of appliances you power at a time.
How to convert from VA to Watts?

Here is the solution to “There are no free MBR slots on the disk” error while creating new partition on Windows 7.
Scenario:

Here are some ways (2 ways below) to show customer address information in registration page.
When you fill up the address fields and signup then both your billing and shipping addresses are filled up.
Here is how to enable address fields in signup page:-