is_null

    (PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

    is_null — Finds whether a variable is null

    Description

    is_null(mixed $value): bool

    Finds whether the given variable is null.

    Parameters

    value

    The variable being evaluated.

    Return Values

    Returns true if value 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

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