Example of filter_var()

example-filter-val.php

<?php
//Lists the available filters you can select from
print_r(filter_list());

//returns 100000000.10
echo filter_var("$100,000,000.10", FILTER_SANITIZE_NUMBER_FLOAT,FILTER_FLAG_ALLOW_FRACTION);

//returns -23423
echo filter_var("-2,3423.2343", FILTER_SANITIZE_NUMBER_FLOAT);

//returns null
echo filter_var('test-at-test.com', FILTER_VALIDATE_EMAIL);

//returns test@test.com
echo filter_var('test@test.com', FILTER_VALIDATE_EMAIL);