| filter_var() | – It gets variable and filter the same as per the ID given |
| filter_has_var() | – Can be used to check whether a variable of specified input type exists |
| filter_input() | – Read the input from the outside script and filter the same |
| filter_var_array() | – Filter multiple variable after reading them |
| filter_id() | – Diaplay the ID number of a given filter |
| filter_input_array() | – Read more than one input from the outside script and filter all |
| filter_list() | – print all filter as an array |