一文详解关于php数据过滤

$pattern = "/w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*/";
if (!preg_match($pattern, $email)) {
        throw new Exception(self::ERROR_PARAMETER_EMPTY . '_邮件格式有误:' . $email);
}

if(!filter_has_var(INPUT_GET, "name"))
{
    echo("name 不存在");
}
else
{
    echo("name 存在");
}

if (!filter_input(INPUT_GET, 'email', FILTER_VALIDATE_EMAIL))
{
    echo "E-Mail is not valid";
}
else
{
    echo "E-Mail is valid";
}

$filters = array
(
    "name" => array
    (
        "filter"=>FILTER_CALLBACK,
        "flags"=>FILTER_FORCE_ARRAY,
        "options"=>"ucwords"
    ),
    "age" => array
    (
        "filter"=>FILTER_VALIDATE_INT,
        "options"=>array
        (
            "min_range"=>1,
            "max_range"=>120
        )
    ),
    "email"=> FILTER_VALIDATE_EMAIL,
);
print_r(filter_input_array(INPUT_POST, $filters));

if(!filter_var("someone@example....com", FILTER_VALIDATE_EMAIL))
 {
 echo("E-mail is not valid");
 }
else
 {
 echo("E-mail is valid");
 }

$input = "<span>我是标题</span>";
echo htmlspecialchars($input) . "n";
echo htmlentities($input) . "n";
echo strip_tags($input) . "n";

$input = "-- 'select * from ";
echo addslashes($input) . "n";