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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.
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. answered Mar 12, 2012 at 17:19. gen_Eric. 227k42301342. If the variable isn't set, is_null () returns true but also throws a "notice: undefined variable" error.
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. Using is_null Function
The null type. isset () - Determine if a variable is declared and is different than null. is_bool () - Finds out whether a variable is a boolean. is_numeric () - Finds whether a variable is a number or a numeric string. is_float () - Finds whether the type of a variable is float.
30 sty 2019 · isset ( mixed$var [, mixed$... ] ) : bool Code language: PHP (php) Determine if a variable is set and is not NULL. If a variable has been unset with unset (), it will no longer be set. isset () will return FALSE if testing a variable that has been set to NULL.
The IsNull() function checks whether an expression contains Null (no data). This function returns a Boolean value. TRUE (-1) indicates that the expression is a Null value, and FALSE (0) indicates that the expression is not a Null value.
This MSAccess tutorial explains how to use the Access IsNull function with syntax and examples. The Microsoft Access IsNull function returns TRUE if the expression is a null value. Otherwise, it returns FALSE.
