Is Combining `isset()` and `!empty()` in PHP Redundant?

Is Checking Both isset() and !empty() Redundant?

In PHP, it's common to check variables using either isset() or !empty(). However, there's a misconception that using both checks is a necessary redundancy.

The Difference Between isset() and !empty()

• isset() checks whether a variable is set and not null.
• !empty() checks whether a variable is set, not null, and non-empty (i.e., contains a value that is not considered false).

Is Double Checking Redundant?

Yes, the double boolean check isset($vars[1]) AND !empty($vars[1]) is redundant. !empty() effectively combines the functionality of isset() and checking for non-emptiness.

A Shorter Alternative

Instead of using the double check, you can simply use:

!empty($vars[1])

This will perform the same checks as both isset($vars[1]) and !empty($vars[1]), without the redundancy.

Additional Considerations

Remember that !empty() doesn't throw warnings if the variable doesn't exist, while isset() does. This is why !empty() is often preferred when you're unsure whether a variable is set.

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