Check whether the given IP is valid or not
Example
======

<?php
if(filter_var(“345.454.3.3”, FILTER_VALIDATE_IP)) {
echo “Valid IP”;
}else{
echo “invalid IP”;
}
?>

Output
=====

invalid IP

print all filter as an array

General Format
=============

filter_list()

Example
======

<?php
echo “<pre>”;
print_r(filter_list());
?>

Output
=====

Array
(
[0] => int
[1] => boolean
[2] => float
[3] => validate_regexp
[4] => validate_url
[5] => validate_email
[6] => validate_ip
[7] => string
[8] => stripped
[9] => encoded
[10] => special_chars
[11] => full_special_chars
[12] => unsafe_raw
[13] => email
[14] => url
[15] => number_int
[16] => number_float
[17] => magic_quotes
[18] => callback
)

Read more than one input from the outside script and filter all

General Format
=============

filter_input_array(input_type, filter_args)

input_type – A valid input type

*) INPUT_COOKIE
*) INPUT_GET
*) INPUT_ENV
*) INPUT_POST
*) INPUT_SERVER

filter_args – Array filter arguments

Example
=======

<?php
$filters = array( “phone” => FILTER_VALIDATE_INT, “url”=> FILTER_VALIDATE_URL, );
print_r(filter_input_array(INPUT_POST, $filters));
?>

Diaplay the ID  of a given filter

General Format
==============

filter_id(filterName)

filterName – filter name to get the id of it

Example
=======

<?php
echo(filter_id(“validate_url”));
?>
Output
=====

273

Filter multiple variable after reading them

General Format
==============

filter_var_array(array, args)

array – Array of values to be filtered

args – array of filter arguments

Example
=======

<?php
$array = array ( “zipcode” => “453441s”, “email” => “info@phpcodez.com”, );
$filters = array ( “zipcode” => FILTER_VALIDATE_INT, “email”=> FILTER_VALIDATE_EMAIL, );
print_r(filter_var_array($array, $filters));
?>

Output
=====

Array ( [zipcode] => [email] => info@phpcodez.com )

Read the input from the outside script and filter the same
Genaral Format

filter_input(input_type, variable, filter)

Input_type – a valid input ype

*) INPUT_COOKIE
*) INPUT_GET
*) INPUT_ENV
*) INPUT_POST
*) INPUT_SERVER

variable – Value to be filtered

filter – A valid ID

Example

<?php
if (filter_input(INPUT_POST, ‘url’, FILTER_VALIDATE_URL)) {
echo “Valid URL”;
}else {
echo “Invalid URL”;
}
?>

It can be used to check whether a variable of specified input type exists

General Format

filter_has_var(type, variable)

type – Possible types and can be one of the followings

*) INPUT_COOKIE
*) INPUT_GET
*) INPUT_ENV
*) INPUT_POST
*) INPUT_SERVER

variable – hold the value to be checked

Example
=======

<?php
if(!filter_has_var(INPUT_GET, “email”)){
echo(“Does not exist”);
}else {
echo(“Exists”);
}
?>

It filter the variable as per the specified ID

Example