$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"

$email = "lastchiliarch@163.com";
  var_dump(checkdnsrr(array_pop(explode("@",$email)),"MX"));
  $email = "1@a.com";
  var_dump(checkdnsrr(array_pop(explode("@",$email)),"MX"));
 
  输出:
  bool(true)
  bool(false)

$email_arr = array("lastchiliarch@163.com", "1@a.com");
  foreach($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

<&＃63;php
 header ( "Content-Type: text/html; charset=UTF-8" );
 $reply = "";
 if ( isset($_POST["email_address"]) )
 {
  $email_address = $_POST["email_address"];
  $pattern = "/^([0-9A-Za-z\\-_\\.]+)@([0-9a-z]+\\.[a-z]{2,3}(\\.[a-z]{2})&＃63;)$/i";
  if ( preg_match( $pattern, $email_address ) )
  {
   $reply = "您输入的电子邮件地址合法

\n";
   $user_name = preg_replace( $pattern ,"$1", $email_address );
   $domain_name = preg_replace( $pattern ,"$2", $email_address );
   $reply .= "用户名：".$user_name."
\n";
   $reply .= "域名：".$domain_name."
\n\n";
  }
  else
  {
   $reply = "您输入的电子邮件地址不合法";
  }
 }
&＃63;>






电子邮件地址验证程序

请输入电子邮件地址：



<&＃63;php
 echo $reply;
&＃63;>