I have no clue if it's a blug or if it is as intended, in which case the documentation needs to be fixed.When the flag is used on a validation filter other than FILTER_VALIDATE_BOOLEAN, as expected the filter will return NULL instead of FALSE upon failure.The version reported by the UEFI firmware resource device should not have changed.Steps Note The feedback system for this content will be changing soon. If content within a comment thread is important to you, please save a copy.This is quite useful when filtering a POST form with filter_input_array(), where you don't want to check what field is invalid and what field is missing.Just check if NULL is among the returned elements and you're done.Steps The following steps should be completed for each ESRT entry that is supported by the platform.
I've been using that since PHP 5.2, and as of PHP 5.6.8 it still works.If FILTER_NULL_ON_FAILURE is not used then NULL is returned when the variable name is not set in the external variable array, TRUE is returned for "1", "true", "on" and "yes" and FALSE is returned for everything else.FILTER_FLAG_QUERY_REQUIRED is failing URLs that are encoded e.g. q=big So anything more than one word encoded fails.Often I see some code like the following:$value = "12";if( filter_var($value, FILTER_VALIDATE_INT) )The above works as intended, except when $value is "0". For the correct behavior, you have not only to check if it is equal (==) to false, but also identic (===) to FALSE:$value = " 0 ";if( filter_var($value, FILTER_VALIDATE_INT) === FALSE )I hope, I could help.It's good to remember that using filter_var is primarily for filtering input values when doing boolean logic comparisons.The following steps should be completed for each ESRT entry that is supported by the platform.Or in other words, for System firmware and each device firmware that supports updating firmware through Update Capsule.Note that if using FILTER_NULL_ON_FAILURE as a flag with the FILTER_VALIDATE_BOOLEAN id then NULL is no longer returned if the variable name is not set in the external variable array. In the description is says that when using the FILTER_NULL_ON_FAILURE flag that ' FALSE is returned only for "0", "false", "off", "no", and ""' an makes no mention of this additional state that can also return false.The behavior is mentioned on the filter_input documentation page under Return Values but that is not overly helpful if one is just looking here.I think "Beware a valid URL need not specify..." would be better.FILTER_VALIDATE_EMAIL is discarding valid e-mail addresses containing IDN.