PHP Filter Functions

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
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