Constant Variables
In PHP, the constant is an identifier or a name for a simple value. The constant value can't be changed during script execution. In PHP, the variable is a name or symbol which stands for value and used to store values such as characters, numeric, character string and memory addresses.
No dollar sign ($) is required before using a constant. Variables require a dollar sign ($) to be executed.
It can't be defined by simple assignment. Only define() function can define it. It is possible to define a variable by simple assignment.
It can be redefined or undefined after it gets set. We can redefine or undefine after it gets set.
define('TITLE', 'Best Interview Question') $title = 'Best Interview Question'

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