PHP正则验证邮箱的函数

PHP #邮箱 #正则 #函数2012-06-03 19:26
01<?php
02 
03function validateEmail($email)
04{
05   $isValid = true;
06   $atIndex = strrpos($email, "@");
07   if (is_bool($atIndex) && !$atIndex)
08   {
09      $isValid = false;
10   }
11   else
12   {
13      $domain = substr($email, $atIndex+1);
14      $local = substr($email, 0, $atIndex);
15      $localLen = strlen($local);
16      $domainLen = strlen($domain);
17      if ($localLen < 1 || $localLen > 64)
18      {
19         // local part length exceeded
20         $isValid = false;
21      }
22      else if ($domainLen < 1 || $domainLen > 255)
23      {
24         // domain part length exceeded
25         $isValid = false;
26      }
27      else if ($local[0] == '.' || $local[$localLen-1] == '.')
28      {
29         // local part starts or ends with '.'
30         $isValid = false;
31      }
32      else if (preg_match('/\\.\\./', $local))
33      {
34         // local part has two consecutive dots
35         $isValid = false;
36      }
37      else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/', $domain))
38      {
39         // character not valid in domain part
40         $isValid = false;
41      }
42      else if (preg_match('/\\.\\./', $domain))
43      {
44         // domain part has two consecutive dots
45         $isValid = false;
46      }
47      else if
48(!preg_match('/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\'*+?^{}|~.-])+$/',
49                 str_replace("\\\\","",$local)))
50      {
51         // character not valid in local part unless 
52         // local part is quoted
53         if (!preg_match('/^"(\\\\"|[^"])+"$/',
54             str_replace("\\\\","",$local)))
55         {
56            $isValid = false;
57         }
58      }
59      if ($isValid && !(checkdnsrr($domain,"MX") || checkdnsrr($domain,"A")))
60      {
61         // domain not found in DNS
62         $isValid = false;
63      }
64   }
65   return $isValid;
66}
67 
68?>
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PHP正则验证邮箱的函数

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