(PHP 4, PHP 5, PHP 7, PHP 8)
is_bool — Finds out whether a variable is a boolean
value
The variable being evaluated.
Example #1 is_bool() examples
<?php$a = false;$b = 0;// Since $a is a boolean, it will return trueif (is_bool($a) === true) { echo "Yes, this is a boolean";}// Since $b is not a boolean, it will return falseif (is_bool($b) === false) { echo "No, this is not a boolean";}?>