# is_bool

(PHP 4, PHP 5)

is_bool — Finds out whether a variable is a boolean

### Description

bool is_bool ( mixed `$var` )

Finds whether the given variable is a boolean.

### Parameters

`var`

  The variable being evaluated.

### Return Values

Returns `TRUE` if `var` is a boolean, `FALSE` otherwise.

### Examples

Example#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_float()
- is_int()
- is_string()
- is_object()
- is_array()