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Finds out whether a variable is a boolean

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