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Yeah. Just put the $ sign in front of your desired constant cell. Like $A6 if you wish to just change the number 6 serially and keep a constant, or $A$6 if you do not want anything from that reference to change at all. Example: Cell A5 contains my exchange rate.
PHP 5 Constants. Constants are like variables except that once they are defined they cannot be changed or undefined. PHP Constants. A constant is an identifier (name) for a simple value. The value cannot be changed during the script. A valid constant name starts with a letter or underscore (no $ sign before the constant name). Note: Unlike variables, constants are automatically global across the entire script. Create a PHP Constant.