I just didn’ think of this since I use empty() exactly to find unset variables since those give back an error as well so I just set my checks up to catch those as well.

This is_null() function is an inbuilt function in PHP which is used to find whether a variable is NULL or not. Three useful functions for this are isset() and empty() are often viewed as functions that are opposite, however this is not always true. Looks like I forgot to put an exclamation mark in front of the isset() check.

empty($empty_object) === false for some reason.Don’t ever use is_null for Singleton, it will generate exceptionisset() and empty() are not a functions but language constructs.This is was very helpful it cleared the confusion between empty and isset. PHP has multiple functions used to check PHP variables with respect to their initialized values. is empty string.One more, in form validation why we need to do isset() check before empty() because what I concern is we want to check either the field is leave blank or has value, isn’t it?Yes we use isset() to see if the variable exists and then use empty() to check if the variable has value or not.

If these functions are not used in correct way they can cause unexpected results.

The is_null function is used to test whether a variable is NULL or not. Before we go into details of is_null vs null in php. PHP 7 isset() vs empty() vs is_null() share | improve this answer | follow | answered Nov 28 '19 at 20:28. Your post was very helpful as it saved me from having to look all over the place to find a simple answer. down. People usually write very bad and slow code. This variable is not set at all, but I don’t get false back. I have learned so many things from your post.It’s nice to hear that the post was helpful to you. The === operator tests for the same value and the same TYPE.

isset() can be applied to unknown variables, but is_null() only to declared variables.Thanks Denis for pointing that out. It returns True if the given variable is null, otherwise return False.It is an identical comparison operator and it returns true if the value of $x is equal to NULL. NULL is a special value in PHP, it represents that a variable does contain any value or a variable is undefined. Perfect job.For var $var; (a variable declared, but without a value) I get:So it isn’t set which would make intuitive sense since we’ve declared but it’s uninitialized. Saving microseconds on a lot of "simple" operations in the entire PHP execution chain usually results in being able to serve more pages per second at the same speed, or lowering your cpu usage. Syntax Despite the design wishing some consistency (outlined in the selected answer here), it all get confusing when you consider method returns that use false/null in not-so-easy to reason ways. The is_null () function is used to test whether a variable is NULL or not. A second look into the PHP specs tells that is_null() checks whether a value is null or not. Since this happened I have starting checking my posts multiple times before posting as I don’t want to post incorrect information.Please ignore Teo Teo’s judgmental and negative comments.This post has been very helpful to me and many other people. But as the site grows and number of users actively uses that service.

Just problably an empty string.When I explicitly unset it, then I get false back. empty() is to check if a given variable is empty.

Reading the comments and the type and number of amendments to the original post solidifies my opinion on the majority of such blogs and posts where the author doesn’t have a clue or deep understanding of the (otherwise simple) matter he is writing about. See how php parses different values.

When I fill it in, it echos the content of the text field.Whoops, sorry. A variable is NULL if it has no value, and points to nowhere in memory.

PHP has two (that I know of, and three if you count isset()) methods to determine if a value is null: is_null() and === null.

the result of a function. Helpful for clearing the thoughts.I have just one comment here – You probably need to unset($var) before testing ‘$var; (a variable declared, but without a value)’. Ignore the haters and please continue doing good work.Good article, one scenario missing from your test script is that of an undeclared variable.

So, in performance point of view it is good to use So, in is_null vs null in php battle, ===null will win the match because of its fast performance. I am most appreciative it is available.Thanks bro! If a form field is leave blank, will it return NULL or “”?

PHP: is_null() vs. NULL === Posted on 29 Mar 2011 by hakre From the know your language department: If you can, go with the identical comparison operator === .

I’ll be checking back from time to time and thank you for the answer up front. PHP 5.5.9 is_null - float(2.2381200790405) === - float(1.0024659633636) === faster by ~100ns per call PHP 7.0.0-dev (built: May 19 2015 10:16:06) is_null - float(1.4121870994568) === - float(1.4577329158783) is_null faster by ~5ns per call. All these function return a boolean value. By continuing to use this site, you agree that we use cookies. A variable is considered empty if it does not exist or if its value equals FALSE.

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