PHP 手冊
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# is_bool

(PHP 4 , PHP 5)

is_bool -- Finds out whether a variable is a boolean

## Description

bool is_bool ( mixed var)

Returns `TRUE` if the var parameter is a boolean.

示範 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"; } ?>`

See also is_array(), is_float(), is_int(), is_integer(), is_string(), and is_object().

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