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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.
In PHP, what is the difference between is_null and ==null in PHP? What are the qualifications for both to return true?
9 mar 2018 · Usually this is done via a comparison operator (=, >, <, etc.), but can be done with functions that resolve to one of those two values. Your's is simply a statement--one that doesn't make sense to the computer because it doesn't resolve to True or False. I would use the IsNull function (https://www.techonthenet.com/access/functions/advanced/isnull.
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.
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.
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.
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.
