Is `!empty()` Enough? Why Avoid Double-Checking with `isset()` and `!empty()` in PHP?

Double Boolean Check: Isset and !empty

In PHP programming, it's common to check for both isset() and !empty() on a variable. However, this practice has raised questions about its purpose and relevance.

Difference Between Isset and !empty

isset() verifies if a variable is set, regardless of its value. In contrast, !empty() returns true if a variable is set and not empty. It is essentially shorthand for !isset() || !$foo, where $foo is the variable being checked.

Redundancy

Performing both isset() and !empty() checks is redundant. By using !empty(), you're already accounting for both the existence and non-emptiness of a variable. The additional isset() check provides no further information.

Shorter Way

To eliminate redundancy, simply use !empty($vars[1]) to achieve the desired result. This concise check will determine if the variable exists and is not empty in a single step.

Conclusion

While it may have been common practice in the past, double-checking with isset() and !empty() is no longer necessary. Instead, rely on !empty() for a comprehensive check of a variable's existence and value.

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