在php代码中，经常会遇到验证邮箱格式是否正确的情况，本节分享一段入门级的参考代码，教大家一些基础的验证方法。
代码：
<html>
<head>
<title>php Email验证的演示示例-www.jb200.com</title>
</head>
<body>
<form name="form1" method="post" action="EMailValidation.php">
<table>
<tr>
<td colspan="2"><b>请输入一个Email地址</div></td>
</tr>
<tr>
<td width="25%">E-mail</td>
<td width="75%">
<input type="text" name="email" size="30">
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" name="Submit" value="Submit">
</td>
</tr>
</table>
</form>
</body>
</html>
<!-- EMailValidation.php
<html>
<head>
<title> 验证Email地址 </title>
</head>
<body>
<?php
if (!isset($email)){
die("没有检测到任何的Email地址数据");
}
if(empty($email)) {
die("您输入的内容为空");
}
if ( (strlen($email) < 3) || (strlen($email) > 200)) {
die("Email长度不符合要求");
} elseif(!ereg("@",$email)) {
die("Invalid E-mail address, no @ symbol found");
} else {
echo "<b>".$email."</b> is correct in format.<br>";
}
list($username,$hostname) = split("@",$email);
if ( (empty($username)) or (empty($hostname)) ) {
die("username or host name section is not valid.");
}
if(checkdnsrr($hostname)) {
echo "<b>". $email ."</b> hostname has a valid MX record !<br>";
} else {
die("<b>". $email ."</b> hostname does not exist");
}
?>
<br>
</body>
</html>
-->