PHP 驗證、過濾

filter_var()

http://php.net/manual/en/function.filter-var.php

<?php
$url = "https://www.w3schools.com";

if (!filter_var($url, FILTER_VALIDATE_URL) === false) {
    echo("$url is a valid URL");
} else {
    echo("$url is not a valid URL");
}
?>

Validate filters 驗證

http://php.net/manual/zh/filter.filters.validate.php#filter.filters.validate

Sanitize filters 消毒

http://php.net/manual/zh/filter.filters.sanitize.php