The require() function is identical to include(), except that it handles errors differently.
You can insert the content of one PHP file into another PHP file before the server executes it, with the include() or require() function.
The PHP date() function formats a timestamp to a more readable date and time.
Magic quotes would automatically escape risky form data that might be used for SQL Injection with a backslash \. The characters escaped by PHP include: quote ', double quote ", backslash \ and NULL characters.
The built-in $_POST function is used to collect values in a form with method="post".