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php_filter_int (called via the constant FILTER_VALIDATE_INT) has the options min_range and max_range. they allow the user to not only test if a value is a double but also if the value is inside a specific range. php_filter_float (called via the constant FILTER_VALIDATE_FLOAT) didn't provide this yet, making validation of numeric but not-only-int values more complicated for the user. this commits implements the options min_range and max_range for the function php_filter_float to fix this inconsistency.