基础问题，在线等在线结贴

<?php$YourEmailAddress = "";error_reporting (E_ALL ^ E_NOTICE);$post = (!empty($_POST)) ? true : false;if($post) {	function ValidateEmail($email){		$regex = "^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$^";		$eregi = preg_replace($regex,'', trim($email));				return empty($eregi) ? true : false;	}	$subject = "Quick contact from home page";	$to = $YourEmailAddress; //trim($_POST['to']);	$email = trim($_POST['user-email']);	$message = stripslashes($_POST['user-message']);	$error = '';	$Reply=$to;	$from=$to;		if(!$email) { 		$error .= '请输入邮箱地址<br />';	}	if($email && !ValidateEmail($email)) {		$error .= '请输入验证过的邮箱<br />';	}	if(!$message || strlen($message) < 3) {		$error .= "请输入留言信息<br />";	}		if(!$error) {		$messages="From: $email <br>";		$messages.="Email: $email <br>";		$messages.="Message: $message <br>";		$emailto=$to;				$mail = mail($emailto,$subject,$messages,"from: $from <$Reply>\nReply-To: $Reply \nContent-type: text/html");				if($mail) {			echo '成功';		}	} else {		echo '<div class="error">'.$error.'</div>';	}}?>