FILTER_VALIDATE_BOOLEANFILTER_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.
Here is a list of outputs we will get for different data stored in variable.
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
The output for different value of the variable is listed here for easy understanding.
As you can see we are getting NULL value for all non boolean values.
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FILTER_VALIDATE_EMAIL: Validating Email
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FILTER_VALIDATE_BOOLEAN: Validating boolean variable
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