试图运行php脚本，检查在mysql数据库的最后期限，并在同一数据库发送电子邮件给用户

我一直在到处搜索stackoverflow，但就是找不到解决我问题的方法。我正试图建立一个php脚本(用于cron作业)，在我的数据库中检测当前日期是否已满足并向该用户发送电子邮件。不管什么原因，我都不能让它运行。也许你们当场就看到了?

表项如下:

date =要检查的日期Email =提醒要发送到的邮箱地址

<?php
    header("Content-type: text/plain");
// OPEN DATA BASE
    define("HOSTNAME");
    define("USERNAME");
    define("PASSWORD");
    define("DATABASE");
    mysql_connect(hostname, username, password) or die("Connection to database failed!");
    mysql_select_db(database); 
    taskdeadline();

// MAIN FUNCTION
function taskdeadline() {
$result = mysql_query("SELECT * FROM members WHERE date = NOW()");
while ($row = mysql_fetch_array($result)){
 $task = row['task'];
 $mail_to = $row['email'];
   if (!empty($mail_to)){
sendEmail($mail_to);
echo "E-Mail send to $mail_to. 'n";
   }
}
}

// SEND EMAIL FUNCTION
function sendEmail($mail_to, $task) {
$from    = "my@emailaddress.com";
$message = "Hello! You are the user with the email address $email and the task $task. Your deadline has been reached.";
$headers = 'From: '.$from."'r'n" .
'Reply-To:'.$_POST['email']."'r'n" .
"Content-Type: text/html; charset=iso-8859-1'n".
'X-Mailer: PHP/' . phpversion();
mail($mail_to, $message, $headers);
}
?>