What is the difference between empty and is_null?

If var is a non-null or non-zero value, empty () returns FALSE. In other words, 0, 0, NULL, FALSE, array (), var $ var; and objects without any attribute will be considered empty. If var is empty, returns TRUE.

What is the difference between empty and is_null?

Bool empty (mixed $ var)

If var is a non-null or non-zero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, array (), var $ var; and objects without any attributes will be considered empty, if var is null, TRUE is returned.

Empty () is the antonym of (boolean) var except when the variable is not set.

The variable is considered NULL in the following cases:

Bool is_null (mixed $ var)

If var is null, TRUE is returned; otherwise, FALSE is returned.

The value is NULL.

Not assigned.

Unset ().