How do you insert a PHP constant into a SQL query?

Question

I have a PHP file with my database configuration settings defined as constants, for example:

Answer 1

I've found two ways.

1.-

define("VALUE1", "someValue");
$query = "SELECT * FROM TABLE WHERE `Column` /*=" . VALUE1 . "*/";

2.-

define("VALUE1", "someValue");
define("VALUE2", "otherValue");
$query = "INSERT INTO TABLE (`Column1`, `Column2`) VALUES (" . VALUE1 . ", " . VALUE2 . ")";

The backticks (``) I use because I'm using phpmyadmin, you might not need them.