data Filter(); php code example

Example 1: sanitize form data php

# sanitize form data
function clean($data)
{
    $data = htmlspecialchars($data);
    $data = stripslashes($data);
    $data = trim($data);
    return $data;
}

Example 2: how can use filter in php7.2

Odd :
Array
(
    [a] => 1
    [c] => 3
    [e] => 5
)
Even:
Array
(
    [0] => 6
    [2] => 9
    [4] => 10
    [6] => 12
)