is_bool

(PHP 4, PHP 5)

is_bool --  Finds out whether a variable is a boolean

Описание

bool is_bool ( mixed var )

Finds whether the given variable is a boolean.

Список параметров

var

The variable being evaluated.

Возвращаемые значения

Returns TRUE if var is a boolean, FALSE otherwise.

Примеры

Пример 1. is_bool() examples

<?php
$a = false;
$b = 0;

// Since $a is a boolean, this is true
if (is_bool($a)) {
   echo "Yes, this is a boolean";
}

// Since $b is not a boolean, this is not true
if (is_bool($b)) {
   echo "Yes, this is a boolean";
}
?>

Смотрите также

is_float()
is_int()
is_string()
is_object()
is_array()



is_bool
21-Apr-2006 04:12
Small caveat to rh's post: back in PHP 3, "0" would be considered non-empty (i.e., empty would return false), even though (bool) on "0" would also evaluate to false; thus, they would not be complete opposites for someone using PHP 3.
rh at richardhoward dot net
22-May-2005 11:17
punkpuke is wrong here; what he means to say is that empty($x) is the opposite of (bool)$x.  is_bool($x) returns true where $x === false.

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 Last updated: Tue, 15 Nov 2005