Description:
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When using an array for filter variables and one sub-array is (or has) an reference the filter will not filter. 
This happens in all versions PHP >= 7. In PHP 5.6 it works correct.
It takes me a long time to figure out, that the reference in the array produces the wrong behavior. If you var_dump $args before using it all seems fine.


Test script:
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#array to filter
$data = ['foo' => 6];
#filter args
$args = ['foo'=> ['filter' => FILTER_VALIDATE_INT,'flags' => FILTER_FORCE_ARRAY]];
$args['foo']['options']=[];
#create reference
$options = &$args['foo']['options'];
#set options
$options['min_range']=1;
$options['max_range']=5;
#show the filter result
print_r(filter_var_array($data,$args));

Expected result:
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Array ( [foo] => Array ( [0] => ) )

Actual result:
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Array ( [foo] => Array ( [0] => 6 ) )