Usually I use source code editor Notepad++ (Not Notepad from Microsoft) to write PHP/MySQL scripts. Notepad++, created by Don Ho, is a lightweight and robust editor with syntax highlighting for various programming languages. It is distributed as free software.
You can download the latest version of Notepad++ (6.6.8) at here and click the "Download" button.
Select the first option (Notepad++ installer) and download to your PC. Click the execution file to activate installation.
You will be asked to select a language. Click OK for English.
Next you will see a welcome message.Click Next button.
Click "I Agree" to install the program.
Find a directory for installation. The default setting should be good enough. Click Next to proceed.
The default suggested components is good enough as a start. Click "Next".
Click "Install" to proceed.
When installation completed, click "Finish".
The installed Notepad++ will be activated. Now we can start our coding. :)