What are the differences between PHP constants and 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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