What are the main differences between const vs define

Here are the main differences between const and define in PHP:

Syntax

• const is a language construct used to declare constants. The syntax is:

const CONSTANT_NAME = value;

• define is a function used to declare constants. The syntax is:

define('CONSTANT_NAME', value);

Scope

• const constants are visible within the entire scope they are defined in (class, function, file, etc).
• define constants are global by default, but can be made class-scoped using the optional third parameter.

Evaluation

• const values are evaluated at compile-time.
• define values are evaluated at runtime.

Allowed Values

• const can only be used to store scalar values (int, float, string, bool) and arrays.
• define can store any...