EMPTY OR ISSET PHP HOW TO
EMPTY OR ISSET PHP CODE
EMPTY OR ISSET PHP SERIES

Identical (but maybe we also don't need the !empty here?)

I also often see the redundancy that makes no sense: // Bad Examples Method arguments public function read($key, $context = null) Let’s look into more concrete examples now. Luckily IDEs these days provide a lot more help than a few years ago, but there is still lot of room for error.

EMPTY OR ISSET PHP CODE

Only ever use empty()/ isset() if that is not possible, that means if there is a chance that the variable or attribute could be not set at this point in time.īut for variables and attributes you might want to ask yourself it that is maybe not a code smell after all if you do not know that for certain. The basic rule is: Always prefer non-silent checks.Īlso always try to compare with = checks and expect the variable or attribute to be declared at run-time. This should never be used though as this can have side-effects depending on the implementation of the class and is absolutely not necessary. Since PHP 5.5+ it is now even possible to check expressions and more, so !empty($this->foo()) would be possible. Since this one piece of code didn’t have a test for it, it also remained dormant for a very long time. The class attribute $compiledRoute was renamed, but a single use of that one was checked with !empty(), so that part of the code inside this check became unreachable and dead forever. There was an actual bug in the CakePHP framework because of this. Now, that sounds like 'so who cares' – but it in fact has quite some impact in the correctness of code, especially when refactoring is involved. If it exists it also checks of the content is not empty or set.Checks if that variable exists at this point in time, if not silently bail early.The main problem is that it does two things at the same time: I have seen this in many frameworks,Īnd in retrospective also in my own code for quite some time. Very often people abuse empty()/ !empty() and isset()/ !isset() where they shouldn’t. In this case simply using the correct way of checkingįor variable content can avoid quite a few bugs in the long run.

Sometimes it is the small things than can make all the difference.

EMPTY OR ISSET PHP SERIES

This method returns the result as a Boolean value TRUE or FALSE.This is another part of the series 'How to write better PHP code'. The is_null() method used to check whether a variable is NULL or not. Output : $age is either 0, empty, or not set at all PHP is_null() Method Evaluates to true because $age is emptyĮcho '$age is either 0, empty, or not set at all' Syntax:Įmpty( $variable ) PHP empty() example $age = 0 If the value is an empty string, false, array(), NULL, 0, and an unset then empty() function returns TRUE and if a value is not empty then it returns FALSE. The empty() is also an in-built method that is used to determine if a variable is set and not empty. Output: $age is set even though it is empty PHP empty() Function Isset(variable) Example of PHP isset() Function $age = 0 Įcho '$age is set even though it is empty' This function returns the result as a Boolean value True or False. This isset() method used to determine if a variable is set and is not NULL. Here, I will explain the differences between these functions. All these functions return a Boolean value. The functions isset(), empty(), and is null() are PHP built-in functions that are used to check the value of a variable or its initialization. To see if a variable has a value, use the functions isset(), empty(), and is null(). These methods are used to determine a variable’s value. This php tutorial help to understand difference between PHP isset() vs empty() vs is_null().

EMPTY OR ISSET PHP HOW TO

In this tutorial, I’ll show you how to check if an element has been defined and see if it is empty or null.

Empty or isset php