Name of a variable to get.
The ID of the filter to apply. The Types of filters manual page lists the available filters.
If omitted, FILTER_DEFAULT will be used, which is equivalent to * FILTER_UNSAFE_RAW. This will result in no filtering taking place by * default.
FILTER_DEFAULT
FILTER_UNSAFE_RAW
Associative array of options or bitwise disjunction of flags. * If filter accepts options, flags can be provided in "flags" field of array.
This function is useful for retrieving many values without repetitively calling filter_input().
filter_input()
An array defining the arguments. * A valid key is a string containing a variable name and a valid value is either a filter type, * or an array optionally specifying the filter, flags and options. * If the value is an array, valid keys are filter which specifies the filter type, * flags which specifies any flags that apply to the filter, and options * which specifies any options that apply to the filter. See the example below for a better understanding.
string
array
This parameter can be also an integer holding a filter constant. * Then all values in the input array are filtered by this filter.
Add missing keys as NULL to the return value.
NULL