我是 php 的新手。我觉得我有问题strpos。我已经尝试了一切，但没有任何帮助。
PHP 文件：
function addMailToXML() {
$new = $_POST['new-mail'];
$mails = array();
$subject = "";
$body = "";
$data = loadConfig();
if(!check_email_address($_POST['new-mail'])){
echo 'Wrong address!!!';
} else {
if(strpos($data['mails'], $new) !== false) {
echo 'Already in database!!!';
} else {
$data['mails'][] = trim($new);
saveConfig($data['mails'], $data['subject'], $data['body']);
echo 'Successfully registered.';
}
}
}
XML 文件：
<?xml version="1.0" encoding="UTF-8"?>
<item><mails>aaa@email.com,ccc@email.com,bbb@email.com</mails><subject></subject><body></body></item>