FILTER_VALIDATE_BOOLEAN

FILTER_VALIDATE_BOOLEAN filter can check the variable Boolean or not. We will use var_dump function to know more about the variable returned. Here is an example.
$var="Off";
var_dump(filter_var($var, FILTER_VALIDATE_BOOLEAN));
Here is a list of outputs we will get for different data stored in variable.
$var="Yes"; // bool(true)
$var="1"; // bool(true)
$var="on"; // bool(true)
$var="True"; // bool(true)

$var="T"; // bool(false)
$var="0"; // bool(false)
$var="False"; // bool(false)
$var=""; // bool(false)
$var="abcd"; // bool(false)
$var="Off"; // bool(false)
$var="no"; // bool(false)
For different value of Boolean variable we will get this output. You can see we get bool(false) for non Boolean value. Now we will add one option FILTER_NULL_ON_FAILURE to get null value for all non Boolean variables. Here is the code
$var="Off";
var_dump(filter_var($var, FILTER_VALIDATE_BOOLEAN,FILTER_NULL_ON_FAILURE));
The output for different value of the variable is listed here for easy understanding.
$var="abcd"; // NULL
$var=""; // NULL
$var="T"; // NULL

$var="1"; // bool(true)
$var="on"; // bool(true)
$var="True"; // bool(true)
$var="Yes"; // bool(true)

$var="False"; // bool(false)
$var="0"; // bool(false)
$var="no"; // bool(false)
$var="Off"; // bool(false)
As you can see we are getting NULL value for all non boolean values.


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