PHP is_bool() Function

Example

Check whether a variable is a boolean or not:

<?php
$a = 1;
echo "a is " . is_bool($a) . "<br>";

$b = 0;
echo "b is " . is_bool($b) . "<br>";

$c = true;
echo "c is " . is_bool($c) . "<br>";

$d = false;
echo "d is " . is_bool($d) . "<br>";
?>

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Definition and Usage

The is_bool() function checks whether a variable is a boolean or not.

This function returns true (1) if the variable is a boolean, otherwise it returns false/nothing.

Syntax

is_bool(variable);

Parameter Values

Parameter	Description
variable	Required. Specifies the variable to check

Technical Details

Return Value:	TRUE if variable is a boolean, FALSE otherwise
Return Type:	Boolean
PHP Version:	4.0+

❮ PHP Variable Handling Reference