In PHP, filters plays an important role to validate and filter data that comes from an insecure sources, like user input, etc.
These are many Php 5 filter functions :
filter_has_var()
It checks whether a variable of a specified input type exist or not.
Syntax:
filter_has_var(type, variable)
Example:
filter_id()
It is used to return the filter ID of any specified filter name.
Syntax:
filter_id(filter_name)
Example:
filter_input()
It is used to get an external variable like form input, etc. and then optionally filters it.
Syntax:
filter_input(type, variable, filter, options)
Example:
filter_input_array()
It is used to get an external variables like form input, etc. and then optionally filters them. Basically, it is useful when we need to filter many values then we can use this function instead of calling filter_input() multiple times.
Syntax:
filter_input_array(type, definition, add_empty)
Example:
filter_list()
It will return the list of all the supported filters.
Syntax:
filter_list()
Example:
filter_var_array()
It is used to get multiple variables and then filter them.
Syntax:
filter_var_array(array, args)
Example:
filter_var()
It is used filters a variable with any specified filter.
Syntax:
filter_var(var, filtername, options)
Example:
