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PHP is_null() Function
Check whether a variable is NULL or not:

<?php
$a = 0;
echo "a is " . is_null($a) . "<br>";

$b = null;
echo "b is " . is_null($b) . "<br>";

$c = "null";
echo "c is " . is_null($c) . "<br>";

$d = NULL;
echo "d is " . is_null($d) . "<br>";
?>
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https://www.php.net/manual/en/function.is-null
PHP: is_null - Manual
WEBSee Also ¶. The null type. isset () - Determine if a variable is declared and is different …
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PHP is_null() and ==null - Stack Overflow
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PHP is_null() Function - W3School
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How to check if a variable is null in PHP - StackHowTo
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What is the PHP syntax to check "is not null" or an empty …
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PHP empty() Function - W3School
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https://www.w3schools.com/php/func_var_is_null.asp
PHP is_null() Function - W3Schools
WEBCheck whether a variable is NULL or not: <?php. $a = 0; echo "a is " . is_null ($a) . …
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How to check if a variable is NULL in PHP? - StackHowTo
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php - Check if an object is null (Shortest way) - Stack …
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Stack Overflow
https://stackoverflow.com/questions/9671659
PHP is_null() and ==null - Stack Overflow
WEBis_null is the same as === null. Both return true when a variable is null (or unset). Note …
- Reviews: 1
is_null is the same as === null . Both return true when a variable is null (or unset). Note that I'm using === and not == . === compares...
Best answer
·
71
So you can understand it better: $a = null; $b = 0; is_null($a) // TRUE $a == null // TRUE $a === null // TRUE is_null($b) // FALSE $b == null /...
67
There are a couple really good charts on the php.net site that show how different values react: Type Comparison - php.net
13
You can check the comparison between is_null() and null === $var Good comparison between two
5
===null is recommended by Rasmus Lerdorf, the inventor of PHP. Rasmus says the test for null is faster than the test of isset . His recommendati...
5
== doesn't check the type, so somehow, somewhere, something like the string '' or the string 'null' may come up as equal to null. Use triple e...
4
validation - How to validate null or empty in php Jan 26, 2017
isnull - is_null($x) vs $x === null in PHP Aug 12, 2014
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difference between is_null "== NULL" and "=== NULL" in …
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isnull - is_null($x) vs $x === null in PHP - Stack Overflow
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People also ask
What does null mean in PHP?
PHP keywords are case-insensitive. Therefore, NULL is also case-insensitive. It means that you can use null, Null, or NULL to represent the null value. For example: It’s a good practice to keep your code consistent. If you use null in the lowercase in one place, you should also use it in your whole codebase.
PHP NULL - PHP Tutorial
phptutorial.net
What is is_null() in PHP?
If you use is_null () in a non-standard way or for a specific reason, document it in comments to clarify your code’s intent for other developers who may work on the project. The is_null () function is a versatile tool in PHP that helps you determine whether a variable or object property is null.
Getting the Most Out of PHP's is_null() Function
clouddevs.com
What is is_null in JavaScript?
Think of is_null () as a detective that investigates whether a variable is null or not. It carefully examines the value of the variable and provides a simple "yes" or "no" answer. For instance, imagine you have a variable called $age, and you need to check if it has a null value. You can use is_null () to find out: Copy code
PHP is_null() function (with example)
learnphp.org
What's the difference between is_null & ===?
There is absolutely no difference in functionality between is_null and === null. The only difference is that is_null is a function and thus can be used as a callback, e.g. array_map('is_null', $array). Personally, I use null === whenever I can, as it is more consistent with false === and true === checks.
isnull - is_null($x) vs $x === null in PHP - Stack Overflow
stackoverflow.com
What is is_null() function?
You can also use is_null () in conditional statements or assignments to handle null values in your code effectively. It can be especially useful when dealing with database queries or user inputs, where null values are quite common. I hope this explanation helps clarify the concept of the is_null () function.
PHP is_null() function (with example)
learnphp.org
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PHP Tutorial
https://www.phptutorial.net/php-tutorial/php-is_null
PHP is_null - PHP Tutorial
Introduction to The Php is_null() Construct
Php is_null() Examples
Php is_null() with Array
Php is_null() with String Index
Php is_null
Summary
PHP is_null() accepts a variable and returns true if that variable is null. Otherwise, it returns false. In this syntax, the $v is the variable to check. If $v doesn’t exist, the is_null() also returns trueand issues a notice. Since the is_null() is a language construct, not a function, you cannot call it via variable functions. For example, the fo...
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Learn PHP Development
https://www.learnphp.org/php-is-null-function-with-example
PHP is_null() function (with example) - learnphp.org
WEBJun 6, 2023 · Think of is_null() as a detective that investigates whether a variable is null …
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Variable Is NULL
Php
Tutorial Republic
https://www.tutorialrepublic.com/faq/how-to-check...
How to check whether a variable is null in PHP - Tutorial Republic
WEBAnswer: Use the PHP is_null() function. You can use the PHP is_null() function to check …
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php.sh
http://doc.php.sh/en/function.is-null.html
PHP: is_null - Manual - php.sh
WEBis_null (PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8) is_null — Finds whether a variable is null
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Variable Is NULL
Php Is Null
PHP Tutorial
https://www.phptutorial.net/php-tutorial/php-null
PHP NULL - PHP Tutorial
WEBTo check if a variable is null or not, you use the is_null() function. The is_null() function …
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Variable Is NULL
Php Is_Null vs Null
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CloudDevs
https://clouddevs.com/php/is_null-function
Getting the Most Out of PHP's is_null() Function
WEBThe is_null() function is a versatile tool in PHP that helps you determine whether a …
Tags:
Variable Is NULL
Php Is Null
geeksforgeeks.org
https://www.geeksforgeeks.org/php-is_null-function
PHP | is_null() Function - GeeksforGeeks
WEBLast Updated : 05 Oct, 2021. The is_null () function is an inbuilt function in PHP which is …
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PHP is_null() Function

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PHP: is_null - Manual

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PHP is_null() function (with example)

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validation - How to validate null or empty in php	Jan 26, 2017
isnull - is_null($x) vs $x === null in PHP	Aug 12, 2014