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is_null

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

is_null — Finds whether a variable is NULL

Description

is_null ( mixed $var ) : bool

Finds whether the given variable is NULL.

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Parameters

var

The variable being evaluated.

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Return Values

Returns TRUE if var is null, FALSE otherwise.

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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)

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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

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Document created the 30/01/2003, last modified the 26/10/2018
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References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

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