https://www.php.net › manual › fr › function.is-null

is_null (PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8) is_null — Indique si une variable vaut null

https://www.w3schools.com › php › func_var_is_null.asp

Learn how to use the is_null() function to check whether a variable is NULL or not in PHP. See the syntax, parameter, return value, and examples of this function.

https://stackoverflow.com › questions › 9671659

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 type as well as value.

https://www.lephpfacile.com › manuel-php › function.is-null.php

Le type NULL. isset () - Détermine si une variable est définie et est différente de NULL. is_bool () - Détermine si une variable est un booléen. is_numeric () - Détermine si une variable est un type numérique. is_float () - Détermine si une variable est de type nombre décimal.

https://www.phptutorial.net › php-tutorial › php-is_null

In this tutorial, you'll learn how to use the PHP is_null () construct to check if a variable is null.

https://www.phptutorial.net › php-tutorial › php-null

To check if a variable is null or not, you use the is_null() function. The is_null() function returns true if a variable is null; otherwise, it returns false. For example: <?php. $email = null; var_dump(is_null($email)); // bool(true) $home = 'phptutorial.net';

https://www.w3docs.com › learn-php › is-null.html

The is_null() function is a built-in function in PHP that checks whether a variable is null or not. Null is a special value that represents the absence of a value. Syntax. The syntax of the is_null() function is as follows: bool is_null (mixed $var) The function takes a single parameter, $var, which is the variable to be checked for being null.

http://doc.php.sh › en › function.is-null.html

Variable handling Functions. is_null. (PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8) is_null — Finds whether a variable is null. Description 露. is_null ( mixed $value ): bool. Finds whether the given variable is null. Parameters 露. value. The variable being evaluated. Return Values 露. Returns true if value is null, false otherwise. Examples 露.

https://www.slingacademy.com › article › ways-to-check-if-a-variable-is-null-in-php

In this article, we will explore several ways to check if a variable is NULL in PHP, outlining the steps, code examples, performance considerations, and discussing the pros and cons of each method.

https://www.php.net › manual › en › language.types.null

Use is_null() or '===' if there is possible of getting empty array. NULL is supposed to indicate the absence of a value, rather than being thought of as a value itself. It's the empty slot, it's the missing information, it's the unanswered question. It's not a jumped-up zero or empty set.