Sanitze 电子邮件地址

删除除字母，数字以外的所有字符！#$％＆’* + - =？^ _` {|}〜@。[]。

var_dump(filter_var('john@example.com', FILTER_SANITIZE_EMAIL));
var_dump(filter_var("!#$%&'*+-=?^_`{|}~.[]@example.com", FILTER_SANITIZE_EMAIL));
var_dump(filter_var('john/@example.com', FILTER_SANITIZE_EMAIL));
var_dump(filter_var('john\@example.com', FILTER_SANITIZE_EMAIL));
var_dump(filter_var('joh n@example.com', FILTER_SANITIZE_EMAIL));

结果：

string(16) "john@example.com"
string(33) "!#$%&'*+-=?^_`{|}~.[]@example.com"
string(16) "john@example.com"
string(16) "john@example.com"
string(16) "john@example.com"