![]() The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. ![]() ![]() The cookies is used to store the user consent for the cookies in the category "Necessary". ![]() The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. Please share your thoughts on the topic as comments. There was an RFC discussion in CakePHP around the same issue, as direct result of a bug that would never have been there if the above was applied properly. That includes in_array() by the way, one of the functions probably most (framework and project) bugs have been discovered the last months due to this implicit casting issue leading to false positives. There also many buggy comparison cases around the 0 integer and a reason more to try to be more strict in general wherever possible. Declare them as null first if you conditionally populate them somewhere.īear in mind here, that 0 and '0' would not work with either way and in that case you need to be strict in your checks anyway. Usually variables should not just sometimes exist. 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, $context = null) Let’s look into more concrete examples now. Luckily IDEs these days provide a lot more help than a few years ago, but there is still lot of room for error. Only ever use empty()/ isset() if that is not possible, that means if there is a chance that the variable or attribute could be not set at this point in time.īut for variables and attributes you might want to ask yourself it that is maybe not a code smell after all if you do not know that for certain. The basic rule is: Always prefer non-silent checks.Īlso always try to compare with = checks and expect the variable or attribute to be declared at run-time. This should never be used though as this can have side-effects depending on the implementation of the class and is absolutely not necessary. Since PHP 5.5+ it is now even possible to check expressions and more, so !empty($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. This is another part of the series "How to write better PHP code".
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