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The 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.
Variable handling Functions. Change language: is_null. (PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8) is_null — Finds whether a variable is null. Description ¶. is_null (mixed $value): bool. Finds whether the given variable is null. Parameters ¶. value. The variable being evaluated. Return Values ¶. Returns true if value is null, false otherwise. Examples ¶
27 sty 2017 · You 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 === operator echo ...
9 sty 2024 · 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.
PHP is_null. Summary: in this tutorial, you’ll learn how to use the PHP is_null () construct to check if a variable is null. Introduction to the PHP is_null () construct. PHP is_null () accepts a variable and returns true if that variable is null. Otherwise, it returns false. is_null (mixed $v): boolCode language:PHP(php)
6 cze 2023 · You can use is_null () to find out: php. Copy code. $age = null; if (is_null ($age)) { echo "The age is not defined."; } else { echo "The age is defined."; } In the above example, we assigned a null value to $age. Then, we use is_null () to evaluate if $age is null.
16 lut 2023 · The is_null() function is a built-in function in PHP that checks if a variable is null. It returns true if the variable is null and false otherwise. Here’s an example: $myVar = null; if (is_null($myVar)) { echo '$myVar is null'; } else { echo '$myVar is not null'; } Let’s put it to the test.
