这是一个注册表格，供学生报名参加一个迎新会。我已经将电子邮件地址字段设置为数据库中的UNIQUE字段。
我需要做的是，如果电子邮件地址存在，这意味着学生已经注册了一天和一个时间去指导。因此，我不想返回错误消息“该电子邮件地址已存在”，而是返回一条消息：“您已经注册了一个方向日/时间。您注册了。如果您希望更改您的一天/时间，请取消第一天/时间，然后回来报名参加新的活动。“
因此，我需要知道如何搜索数据库以查找他们注册的日期和时间，并在用户尝试多次注册时返回的自定义消息中返回该消息。
<?php
// set the mode
if(isset($_GET['p'])) $mode = $_GET['p'];
else if(isset($_POST['p'])) $mode = $_POST['p'];
else $mode = '';
// sanitize input
if(isset($_GET['time_id'])) {
$timestamp = (int)$_GET['timestamp'];
$time_id = (int)$_GET['time_id'];
}
if(isset($_POST['time_id'])) {
$timestamp = (int)$_POST['timestamp'];
$time_id = (int)$_POST['time_id'];
}
// validate input
$error = '';
if(date("G", $timestamp) != 0)
$error .= 'Invalid timestamp.<br/>';
if(($time_result = valid_time_id($time_id)) == false)
$error .= 'Invalid time id.<br/>';
else
$time_row = mysql_fetch_array($time_result);
switch($mode) {
default:
break;
case "schedule":
// sanitize input
$first_name = sanitize_input($_POST['first_name']);
$last_name = sanitize_input($_POST['last_name']);
$email = sanitize_input($_POST['email']);
$retype_email = sanitize_input($_POST['retype_email']);
$college_id = sanitize_input($_POST['college_id']);
$retype_college_id = sanitize_input($_POST['retype_college_id']);
$phone = sanitize_input($_POST['phone']);
$first = (isset($_POST['first']) ? 1 : 0);
$verification = $_POST['verification'];
// validate input
$error = '';
if(empty($first_name))
$error .= 'You must enter a first name.<br>';
if(empty($last_name))
$error .= 'You must enter a last name.<br>';
if(!valid_email($email))
$error .= 'Invalid email.<br>';
if($email != $retype_email)
$error .= 'The two email addresses don\'t match.<br>';
if(!valid_college_id($college_id))
$error .= 'Invalid student id. Student id must contain seven digits including zeros.<br>';
if($college_id != $retype_college_id)
$error .= 'The two student ids don\'t match.<br>';
if(empty($phone))
$error .= 'You must enter a phone number.<br>';
$student_result = db_query("select id from ".$GLOBALS['db_pre']."student where canceled='0' and timestamp='".$timestamp."' and time_id='".$time_id."'");
if(mysql_num_rows($student_result) >= $time_row['slots'])
$error .= 'Sorry, too many people are already scheduled for this time slot.<br>';
if($_SESSION['captcha'] != $verification)
$error .= 'Invalid image verification.<br>';
// if there's no error
if($error == '') {
// schedule it
db_query("insert into ".$GLOBALS['db_pre']."student set first_name='".$first_name
."',last_name='".$last_name
."',email='".$email
."',college_id='".$college_id
."',phone='".$phone
."',timestamp='".$timestamp
."',time_id='".$time_id
."',unschedule_code='".md5(time())
."',inserted_at='".gmdate("Y-m-d H:i:s")
."'");
$student_id = mysql_insert_id();
// send email to student
$subject = "A-B Tech New Student Appointment Confirmation";
if(current_site() == "orientation") $subject = "A-B Tech New Student Orientation";
else $subject = "A-B Tech Campus Tour";
$message = format_text("Scheduling Email", $student_id);
email($email, $subject, $message);
// get the start and end times for the appointment
$time_result = db_query("select * from ".$GLOBALS['db_pre']."time where id='".$time_id."'");
$time_row = mysql_fetch_array($time_result);
//$timestamp_start = strtotime(date("F j, Y", $timestamp).", ".$time_row['time']);
//$timestamp_end = strtotime("+1 hour", $timestamp_start);
/*// send email, with calendar attachment, to counselors
if(current_site() == "orientation") $subject = "A-B Tech New Student Orientation: ";
else $subject = "A-B Tech Campus Tour: ";
$subject .= date("F j, Y", $timestamp).", ".$time_row['time']."; ".$first_name." ".$last_name."";
$message = "A student has scheduled an appointment:\r\n\r\n";
$message .= "Name: ".$first_name." ".$last_name."\r\n";
$message .= "Date: ".date("F j, Y", $timestamp).", ".$time_row['time']."\r\n";
$message .= "Email: ".$email."\r\n";
$message .= "Phone: ".$phone."\r\n";
// send the email to all the counselors
$user_result = db_query("select * from user where no_email=0");
while($user_row = mysql_fetch_array($user_result)) {
email($user_row['email'], $subject, $message);
}*/
}
break;
}
// captcha image verification
srand(time());
$_SESSION['captcha'] = substr(md5(rand(1,9999)), rand(1,15), 5);
$_SESSION['captcha'] = str_replace("O", "1", $_SESSION['captcha']); // to avoid confusion
$_SESSION['captcha'] = str_replace("o", "2", $_SESSION['captcha']); // ...
$_SESSION['captcha'] = str_replace("0", "3", $_SESSION['captcha']); // ...
// the top layout
layout_top(date("F j, Y", $timestamp).', '.$time_row['time']);
// the middle layout
switch($mode) {
default:
if($mode == "schedule" && $error == "") {
echo display_text("Scheduling Text", $student_id);
?><p><a href="index.php">Click here to go back</a></p><?php
} else {
?>
<h1 align="center" style="padding-bottom: 0; margin-bottom: 0;"><?=strtoupper(date("F j, Y", $timestamp).' '.$time_row['time'])?></h1>
<p align="center" style="padding-top: 0; margin-top: 0;"><strong><a href="index.php?month=<?=date("n", $timestamp)?>&year=<?=date("Y", $timestamp)?>">choose another date</a></strong></p>
<?php if($mode == "schedule" && $error != '') { ?>
<p class="error"><?=$error?></p>
<?php } ?>
<form action="<?=$_SERVER['PHP_SELF']?>" method="post">
<input type="hidden" name="p" value="schedule">
<input type="hidden" name="timestamp" value="<?=$timestamp?>">
<input type="hidden" name="time_id" value="<?=$time_id?>">
<fieldset>
<legend>Schedule an appointment for this date</legend>
<p>Fill out this form to schedule a New Student appointment on this date. Make sure you use a valid email address.</p>
<ul>
<li>
<label for="first_name">First Name</label>
<input type="text" name="first_name"<?=($mode == "schedule" ? ' value="'.$first_name.'"' : '')?>>
</li>
<li>
<label for="last_name">Last Name</label>
<input type="text" name="last_name"<?=($mode == "schedule" ? ' value="'.$last_name.'"' : '')?>>
</li>
<li>
<label for="email">Email</label>
<input type="text" name="email" size="30"<?=($mode == "schedule" ? ' value="'.$email.'"' : '')?>>
</li>
<li>
<label for="retype_email">Retype Email</label>
<input type="text" name="retype_email" size="30"<?=($mode == "schedule" ? ' value="'.$retype_email.'"' : '')?>>
</li>
<li>
<label for="college_id">Student ID(For your student ID#, please refer to the e-mail you received regarding your A-B Tech WebAdvisor and Email Accounts.) </label>
<input type="text" name="college_id" size="30"<?=($mode == "schedule" ? ' value="'.$college_id.'"' : '')?>>
</li>
<li>
<label for="retype_college_id">Retype Student ID</label>
<input type="text" name="retype_college_id" size="30"<?=($mode == "schedule" ? ' value="'.$retype_college_id.'"' : '')?>>
</li>
<li>
<label for="phone">Phone</label>
<input type="text" name="phone"<?=($mode == "schedule" ? ' value="'.$phone.'"' : '')?>>
</li>
<li>
<label for="verification">Verification</label>
<img src="../images/verify.php" width="180" height="40" alt="Verification"><br/>
<input type="text" name="verification" size="10"> <small>« type the characters in the image above into this box</small>
</li>
<li>
<input type="submit" value="Submit">
</li>
</ul>
</fieldset>
</form>
<?php
}
break;
}
// the bottom layout
layout_bottom();
?>
答案 0 :(得分：0)
我这样做的方法是首先验证他们的电子邮件地址是否有效，然后查看它是否存在，然后创建注册条目。
if (!valid_email($email)) {
// show message
return FALSE;
}
$query = "SELECT * FROM database WHERE email = '$email';";
$result = mysql_query($query);
if (mysql_num_rows($result) > 0) {
// email already exists, so tell them to deregister first
return FALSE;
}
$query = "INSERT registration query....";
另外，请确保在查询中使用电子邮件地址之前将其转义。