php判断邮箱地址是否存在的方法，php邮箱地址
PHP校验邮箱地址的方法很多， 比较常用的就是自己写正则了， 不过正则多麻烦， 我PHP自带了方法做校验。
filter_var
filter_var是PHP内置的一个变量过滤的方法， 提供了很多实用的过滤器， 可以用来校验整数、浮点数、邮箱、URL、MAC地址等。
具体的过滤器参考: filters.validate
filter_var如果返回false, 说明变量无法通过过滤器， 也就是不合法了。
$email = "lastchiliarch@163.com"; var_dump(filter_var($email, FILTER_VALIDATE_EMAIL)); $email = "asb"; var_dump(filter_var($email, FILTER_VALIDATE_EMAIL)); $email = "1@a.com"; var_dump(filter_var($email, FILTER_VALIDATE_EMAIL)); 输出： string(21) "lastchiliarch@163.com" bool(false) string(7) "1@a.com"
对于asb这种非法邮箱格式返回了false, 但对于1@a.com则通过了，还是略有瑕疵啊。
不过一般的正则也通过会认为1@a.com是一个合法的邮箱， 那有啥办法可以更精准的验证呢？
checkdnsrr
checkdnsrr其实是用来查询指定的主机的DNS记录的，我们可以借用它来验证邮箱是否存在。
对于1@a.com肯定是MX记录不存在的。
$email = "lastchiliarch@163.com";
var_dump(checkdnsrr(array_pop(explode("@",$email)),"MX"));
$email = "1@a.com";
var_dump(checkdnsrr(array_pop(explode("@",$email)),"MX"));
输出:
bool(true)
bool(false)
可以看到， 很完美， 唯一的缺点就是太慢了， 毕竟是要做一次网络请求。 所以不适合同步对大量的邮箱采用这种做法去校验。
filter_var+checkdnsrr
我们可以接合filter_var 和checkdnsrr做校验， 对于绝大多数的非法邮箱肯定会在filter_var的时候就挂掉了， 剩下的再用
checkdnsrr进一步判断。
$email_arr = array("lastchiliarch@163.com", "1@a.com");
foreach($email_arr as $email) {
if (filter_var($email) === false) {
echo "invalid email: $email \n";
continue;
}
if(checkdnsrr(array_pop(explode("@",$email)),"MX") === false) {
echo "invalid email: $email \n";
continue;
}
}
输出: invalid email: 1@a.com
但要注意的是， 由于只是检查MX记录， 所以只能判断163.com是存在的， 但不能说明lastchiliarch这个用户是存在的。
想要更精确的判断邮箱存在， 那只能连接到smtp服务器去验证了。
下面为大家分享的php邮箱地址正则表达式验证，具体内容如下
<?php
header ( "Content-Type: text/html; charset=UTF-8" );
$reply = "";
if ( isset($_POST["email_address"]) )
{
$email_address = $_POST["email_address"];
$pattern = "/^([0-9A-Za-z\\-_\\.]+)@([0-9a-z]+\\.[a-z]{2,3}(\\.[a-z]{2})?)$/i";
if ( preg_match( $pattern, $email_address ) )
{
$reply = "您输入的电子邮件地址合法<br /><br />\n";
$user_name = preg_replace( $pattern ,"$1", $email_address );
$domain_name = preg_replace( $pattern ,"$2", $email_address );
$reply .= "用户名：".$user_name."<br />\n";
$reply .= "域名：".$domain_name."<br />\n\n";
}
else
{
$reply = "您输入的电子邮件地址不合法";
}
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh" xml:lang="zh">
<head>
<title>电子邮件地址验证程序</title>
</head>
<body style="text-align: center;">
<h1 id="电子邮件地址验证程序">电子邮件地址验证程序</h1>
<form action="#" method="post">
请输入电子邮件地址：<input name="email_address" type="text" style="width: 300px;" /><br />
<input type="submit" value="验证电子邮件地址" />
</form>
<?php
echo $reply;
?>
</body>
</html>
希望大家喜欢这篇文章，对大家有所帮助。
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