我正在 PHP 中创建一个电子邮件订阅表单,并希望检查有效地址以及电子邮件是否已存在于我的数据库中。
我的代码正在连接到我的数据库并插入,但验证以及检查现有电子邮件不起作用。
无论我在表单中输入什么内容,即使我没有输入任何内容,它也会将其插入到我的数据库中。
这是我的所有代码:
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<fieldset>
<legend>Subscribe to Our Newsletter </legend>
<?php if ($feedback!='')
echo('<p>'.$feedback.'</p>'); ?>
<label>Name: <input name="name" type="text" value="<?php echo $name; ?>" /></label>
<label>Email: <input name="email" type="text" value="<?php echo $email; ?>" /></label>
<label><input type="submit" value="Sign Up!" /></label>
</fieldset>
</form>
<?php
$feedback='';
if (!$email) {
$feedback .= '<strong>Please enter your email address</strong><br />';
}
if (!$name) {
$feedback .= '<strong>Please enter your name</strong><br />';
}
list($username, $mailDomain) = explode("@", $email);
if (!@checkdnsrr($mailDomain, "MX")) {
$feedback .= '<strong>Invalid email domain</strong><br />';
}
if(!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/", $email)) {
$feedback .= '<strong>Your email address doesn\'t appear to be valid - please check and try again';
}
function cleaninput($value, $DB) {
if (get_magic_quotes_gpc()) {
$value = stripslashes( $value );
}
return mysql_real_escape_string( $value, $DB );
}
$name=$_POST['name'];
$email=$_POST['email'];
include_once "connect.php";
$sql = mysql_query("SELECT * FROM subscribers WHERE email='$email'");
$numRows = mysql_num_rows($sql);
if ($numRows>0) {
$feedback = '<strong>That email address is already subscribed.</strong>';
}
$insertresult = mysql_query("INSERT INTO subscribers (name, email) VALUES('$name', '$email')") or die (mysql_error());
if ($insertresult) {
$completed = true;
}
if($competed=false) {
?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?> method="post">
<fieldset>
<legend>Subscribe to OUr Newsletter </legend>
<?php
if ($feedback!='')
echo('<p>'.$feedback.'</p>'); ?>
<label>Name: <input name="name" type="text" value="<?php echo $name; ?>" /></label>
<label>Email: <input name="email" type="text" value="<?php echo $email; ?>" /></label>
<label><input type="submit" value="Sign Up!" /></label>
</fieldset>
</form>
<?php
}
else {
echo('Thanks - you have subscribed to our newsletter successfully. You can unsubscribe at any time by clicking the link at the bottom of each email we send.');
}
?>
我脚本中的最后一个回声也总是在那里。它总是显示在我的表单下。不知道为什么会这样。也许我把它放在我的代码中的错误位置。
else {
echo('Thanks - you have subscribed to our newsletter successfully. You can unsubscribe at any time by clicking the link at the bottom of each email we send.');
}
谢谢!