Validating Boolean Values

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var_dump(filter_var(true, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // true
var_dump(filter_var(false, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // false
var_dump(filter_var(1, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // true
var_dump(filter_var(0, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // false
var_dump(filter_var('1', FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // true
var_dump(filter_var('0', FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // false
var_dump(filter_var('', FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // false
var_dump(filter_var(' ', FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // false
var_dump(filter_var('true', FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // true
var_dump(filter_var('false', FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // false
var_dump(filter_var([], FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // NULL
var_dump(filter_var(null, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); // false

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