Question

How to check whether a value is a boolean in PHP

Answer 1

<?php

$v = 100;

if (is_bool($v))
    echo "yes";
else
    echo "no"; // the answer is no


$v = 0;

if (is_bool($v))
    echo "yes";
else
    echo "no"; // the answer is no


$v = -1;

if (is_bool($v))
    echo "yes";
else
    echo "no"; // the answer is no


$v = "";

if (is_bool($v))
    echo "yes";
else
    echo "no"; // the answer is no


$v = true;

if (is_bool($v))
    echo "yes"; // the answer is yes
else
    echo "no";


$v = false;

if (is_bool($v))
    echo "yes"; // the answer is yes
else
    echo "no";  

?>

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