Search results
27 sty 2017 · You can use php variable handling function is_null(mixed $var) which returns TRUE if var is null, otherwise FALSE. <?php $foo = NULL; $bar = 'NULL'; var_dump(is_null($foo), is_null($bar)); ?> OUTPUT. bool(true) bool(false)
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.
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.
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.
For example, you can use this function to convert a Null value to another value and prevent it from propagating through an expression. Or you can use: IIF(IsNull(MaritalStatus),"SINGLE",MaritalStatus)
Example #1 is_null () example. <?php. error_reporting(E_ALL); $foo = NULL; var_dump(is_null($inexistent), is_null($foo)); ?> Notice: Undefined variable: inexistent in ... bool(true) See Also ¶. 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.
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
