https://stackoverflow.com › questions › 11213125
What is the PHP syntax to check "is not null" or an empty string?What I want to do is add a condition to make sure $user is not null or an empty string (it doesn't have to be any particular value, I just don't want it to be empty.) What is the proper way to do this?
https://www.php.net › manual › fr › function.is-null
PHP: is_null - ManualA second look into the PHP specs tells that is_null() checks whether a value is null or not. So, you may pass any VALUE to it, eg. the result of a function. isset() on the other hand is supposed to check for a VARIABLE's existence, which makes it a language construct rather than a function. Its sole porpuse lies in that checking. Passing ...
https://www.w3schools.com › php › func_var_is_null.asp
PHP is_null() Function - W3SchoolsThe is_null() function checks whether a variable is NULL or not. This function returns true (1) if the variable is NULL, otherwise it returns false/nothing.
https://www.delftstack.com › fr › howto › php › php-notnull
Syntaxe pour vérifier non nul et une chaîne vide en PHPCet article vous apprend à vérifier non null et une chaîne vide en PHP. Nous utiliserons les fonctions PHP empty() et is_null() avec l'opérateur de négation.
https://stackoverflow.com › questions › 41887897
How to validate null or empty in php - Stack OverflowYou can use comparison operator ==, === or != to check whether a variable is null or not. <?php $foo = NULL; $bar = 'NULL'; // Using == operator echo "Using '==' operator\n"; if($foo == NULL) echo "foo is NULL\n"; else echo "foo is not NULL\n"; if($bar == NULL) echo "bar is NULL\n"; else echo "bar is not NULL\n"; // Using ...
https://www.slingacademy.com › article › ways-to-check-if-a-variable-is-null-in-php
3 Ways to Check if a Variable is NULL in PHP - Sling AcademyThe is_null() function is a built-in PHP function specifically designed to check if a variable is NULL. It takes one parameter and returns true if the variable is NULL, otherwise it returns false.
https://laraveldaily.com › post › php-check-for-empty-values-not-is-null-vs-isset
PHP Check for Empty Values: "!" vs "is_null" vs "isset" - Laravel DailyWhen checking strings or integers for null values, it is better to avoid loose operations and use strict === null or is_null checks are equivalent. In the same way, strictly not !== null and isset() statements are identical too.
https://www.w3docs.com › learn-php › is-null.html
Is_null() - W3docsThe 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.
https://dev.to › salmazz › php-check-for-empty-values-vs-isnull-vs-isset-vs-isempty-46k4
Decoding PHP's Empty Value Functions: When to Use WhichThe isset() function checks if a variable is set and is not NULL. If a variable has been unset using unset(), has not been assigned a value, or is assigned the value NULL, then isset() will return false. It is often used to check if array keys or object properties exist and are not NULL. Example:
https://www.delftstack.com › howto › php › php-notnull
Syntax to Check for Not Null and an Empty String in PHPThis article teaches you how to check for not null and an empty string in PHP. We'll use PHP empty() and is_null() functions along with the negation operator.
