Finds whether a variable is NULL (original) (raw)

is_null

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

is_null — Finds whether a variable is NULL

Description

is_null ( mixed $var ) : bool

Parameters

var

The variable being evaluated.

Return Values

Returns TRUE if var is null, FALSE otherwise.

Examples

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) 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
• is_numeric() - Finds whether a variable is a number or a numeric string
• is_float() - Finds whether the type of a variable is float
• is_int() - Find whether the type of a variable is integer
• is_string() - Find whether the type of a variable is string
• is_object() - Finds whether a variable is an object
• is_array() - Finds whether a variable is an array