w3resource

PHP: is_bool() function

Description

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

Version:

(PHP 4 and above)

Syntax:

is_bool (var_name)

Parameter:

Name Description Required /
Optional
Type
var_name The variable being checked. Required Mixed*

*Mixed: Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value:

TRUE if var_name is a boolean, FALSE otherwise.

Value Type: Boolean.

Example:

<?php
$var_name=false;
if (is_bool($var_name))
echo 'This is a boolean.';
else
echo 'This is not a boolean.';
?>

Output :

This is a boolean.

View the example in the browser

Previous: is_array
Next: is_callable



PHP: Tips of the Day

Returns true if the given string is a palindrome, false otherwise

Example:

<?php
function tips_palindrome($string)
{
  return strrev($string) === (string) $string;
}

print(tips_palindrome('malayalam'));
print("\n");
print(tips_palindrome(151));

?>

Output:

1
1