When Should I Use `isset()` vs. `!empty()`?

In where shall I use isset() and !empty()

It is often said that isset() treats an empty string as true, thus it is not an effective way to validate text inputs from a HTML form. Therefore, empty() can be used to check that a user has typed something.

It is essential to understand the distinction between empty() and isset(). isset() investigates whether a variable is defined and is not null. Conversely, empty() performs a negation of what isset() does and additionally verifies whether a value is considered empty. An empty value includes an empty string, 0, NULL, false, an empty array, or an empty object.

In most cases, isset() can be employed to determine if a variable has a non-null value, whereas empty() can be utilized to ascertain if it lacks a value. For instance, instead of using if(isset($_GET['gender']))..., one could employ if(!empty($_GET['gender']))... to ascertain whether a user has provided a gender.

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