PHP | is_bool()

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is_bool() is an inbuilt function in php. The is_bool() function is used to find whether a variable is a boolean or not.

Syntax:

boolean is_bool($variable_name)
$variable_name:the variable we want to check.

return value: It is a boolean function so returns TRUE when $variable_name is a boolean value, otherwise FALSE.

Example 1:

PHP

<?php
//php code
$variable_name1 = false;
$variable_name2 = 32;
 
//$variable_name1 is boolean, gives TRUE
if (is_bool($variable_name1))
 
echo "Variable is a boolean. \n";
else
echo 'Variable is not a boolean. \n';
 
//$variable_name2 is boolean, gives FALSE
if (is_bool($variable_name2))
 
echo '32 is a boolean.\n';
else
echo '32 is not a boolean.';
?>

Output:

Variable is a boolean. 
32 is not a boolean.

Example 2:

PHP

<?php
// PHP code
function square($num)
{
    return (is_bool($num));
}
echo square(TRUE) ."\n";   // outputs '1'.
echo square(FALSE) ."\n";   // outputs '1'.
echo square(56) ."\n";   // nothing is returned.
 
?>