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php实现RFC兼容的电子邮件地址验证

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Freigeben： 2016-07-25 08:56:42
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  4. /*
  5. Copyright 2009 Dominic Sayers
  6. (dominic_sayers@hotmail.com)
  7. (http://www.dominicsayers.com)

  8. This source file is subject to the Common Public Attribution License Version 1.0 (CPAL) license.

  9. The license terms are available through the world-wide-web at http://www.opensource.org/licenses/cpal_1.0
  10. */
  11. function is_email ($email, $checkDNS = false) {
  12. // Check that $email is a valid address
  13. // (http://tools.ietf.org/html/rfc3696)
  14. // (http://tools.ietf.org/html/rfc5322#section-3.4.1)
  15. // (http://tools.ietf.org/html/rfc5321#section-4.1.3)
  16. // (http://tools.ietf.org/html/rfc4291#section-2.2)
  17. // (http://tools.ietf.org/html/rfc1123#section-2.1)
  19. // Contemporary email addresses consist of a "local part" separated from
  20. // a "domain part" (a fully-qualified domain name) by an at-sign ("@").
  21. // (http://tools.ietf.org/html/rfc3696#section-3)
  22. $index = strrpos($email,'@');

  23. if ($index === false) return false; // No at-sign

  24. if ($index === 0) return false; // No local part
  25. if ($index > 64) return false; // Local part too long

  26. $localPart = substr($email, 0, $index);

  27. $domain = substr($email, $index + 1);
  28. $domainLength = strlen($domain);
  30. if ($domainLength === 0) return false; // No domain part
  31. if ($domainLength > 255) return false; // Domain part too long

  32. // Let's check the local part for RFC compliance...

  33. //
  34. // Period (".") may...appear, but may not be used to start or end the
  35. // local part, nor may two or more consecutive periods appear.
  36. // (http://tools.ietf.org/html/rfc3696#section-3)
  37. if (preg_match('/^\\.|\\.\\.|\\.$/', $localPart) > 0) return false; // Dots in wrong place

  38. // Any ASCII graphic (printing) character other than the

  39. // at-sign ("@"), backslash, double quote, comma, or square brackets may
  40. // appear without quoting. If any of that list of excluded characters
  41. // are to appear, they must be quoted
  42. // (http://tools.ietf.org/html/rfc3696#section-3)
  43. if (preg_match('/^"(?:.)*"$/', $localPart) > 0) {
  44. // Local part is a quoted string
  45. if (preg_match('/(?:.)+[^\\\\]"(?:.)+/', $localPart) > 0) return false; // Unescaped quote character inside quoted string
  46. } else {
  47. if (preg_match('/[ @\\[\\]\\\\",]/', $localPart) > 0)
  48. // Check all excluded characters are escaped
  49. $stripped = preg_replace('/\\\\[ @\\[\\]\\\\",]/', '', $localPart);
  50. if (preg_match('/[ @\\[\\]\\\\",]/', $stripped) > 0) return false; // Unquoted excluded characters
  51. }

  52. // Now let's check the domain part...

  53. // The domain name can also be replaced by an IP address in square brackets

  54. // (http://tools.ietf.org/html/rfc3696#section-3)
  55. // (http://tools.ietf.org/html/rfc5321#section-4.1.3)
  56. // (http://tools.ietf.org/html/rfc4291#section-2.2)
  57. if (preg_match('/^\\[(.)+]$/', $domain) === 1) {
  58. // It's an address-literal
  59. $addressLiteral = substr($domain, 1, $domainLength - 2);
  60. $matchesIP = array();
  62. // Extract IPv4 part from the end of the address-literal (if there is one)
  63. if (preg_match('/\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/', $addressLiteral, $matchesIP) > 0) {
  64. $index = strrpos($addressLiteral, $matchesIP[0]);
  66. if ($index === 0) {
  67. // Nothing there except a valid IPv4 address, so...
  68. return true;
  69. } else {
  70. // Assume it's an attempt at a mixed address (IPv6 + IPv4)
  71. if ($addressLiteral[$index - 1] !== ':') return false; // Character preceding IPv4 address must be ':'
  72. if (substr($addressLiteral, 0, 5) !== 'IPv6:') return false; // RFC5321 section 4.1.3

  73. $IPv6 = substr($addressLiteral, 5, ($index ===7) ? 2 : $index - 6);

  74. $groupMax = 6;
  75. }
  76. } else {
  77. // It must be an attempt at pure IPv6
  78. if (substr($addressLiteral, 0, 5) !== 'IPv6:') return false; // RFC5321 section 4.1.3
  79. $IPv6 = substr($addressLiteral, 5);
  80. $groupMax = 8;
  81. }

  82. $groupCount = preg_match_all('/^[0-9a-fA-F]{0,4}|\\:[0-9a-fA-F]{0,4}|(.)/', $IPv6, $matchesIP);

  83. $index = strpos($IPv6,'::');

  84. if ($index === false) {

  85. // We need exactly the right number of groups
  86. if ($groupCount !== $groupMax) return false; // RFC5321 section 4.1.3
  87. } else {
  88. if ($index !== strrpos($IPv6,'::')) return false; // More than one '::'
  89. $groupMax = ($index === 0 || $index === (strlen($IPv6) - 2)) ? $groupMax : $groupMax - 1;
  90. if ($groupCount > $groupMax) return false; // Too many IPv6 groups in address
  91. }

  92. // Check for unmatched characters

  93. array_multisort($matchesIP[1], SORT_DESC);
  94. if ($matchesIP[1][0] !== '') return false; // Illegal characters in address

  95. // It's a valid IPv6 address, so...

  96. return true;
  97. } else {
  98. // It's a domain name...

  99. // The syntax of a legal Internet host name was specified in RFC-952

  100. // One aspect of host name syntax is hereby changed: the
  101. // restriction on the first character is relaxed to allow either a
  102. // letter or a digit.
  103. // (http://tools.ietf.org/html/rfc1123#section-2.1)
  104. //
  105. // NB RFC 1123 updates RFC 1035, but this is not currently apparent from reading RFC 1035.
  106. //
  107. // Most common applications, including email and the Web, will generally not permit...escaped strings
  108. // (http://tools.ietf.org/html/rfc3696#section-2)
  109. //
  110. // Characters outside the set of alphabetic characters, digits, and hyphen MUST NOT appear in domain name
  111. // labels for SMTP clients or servers
  112. // (http://tools.ietf.org/html/rfc5321#section-4.1.2)
  113. //
  114. // RFC5321 precludes the use of a trailing dot in a domain name for SMTP purposes
  115. // (http://tools.ietf.org/html/rfc5321#section-4.1.2)
  116. $matches = array();
  117. $groupCount = preg_match_all('/(?:[0-9a-zA-Z][0-9a-zA-Z-]{0,61}[0-9a-zA-Z]|[a-zA-Z])(?:\\.|$)|(.)/', $domain, $matches);
  118. $level = count($matches[0]);

  119. if ($level == 1) return false; // Mail host can't be a TLD

  120. $TLD = $matches[0][$level - 1];

  121. if (substr($TLD, strlen($TLD) - 1, 1) === '.') return false; // TLD can't end in a dot
  122. if (preg_match('/^[0-9]+$/', $TLD) > 0) return false; // TLD can't be all-numeric

  123. // Check for unmatched characters

  124. array_multisort($matches[1], SORT_DESC);
  125. if ($matches[1][0] !== '') return false; // Illegal characters in domain, or label longer than 63 characters

  126. // Check DNS?

  127. if ($checkDNS && function_exists('checkdnsrr')) {
  128. if (!(checkdnsrr($domain, 'A') || checkdnsrr($domain, 'MX'))) {
  129. return false; // Domain doesn't actually exist
  130. }
  131. }

  132. // Eliminate all other factors, and the one which remains must be the truth.

  133. // (Sherlock Holmes, The Sign of Four)
  134. return true;
  135. }
  136. }

  137. function unitTest ($email, $reason = '') {

  138. $expected = ($reason === '') ? true : false;
  139. $valid = is_email($email);
  140. $not = ($valid) ? '' : ' not';
  141. $unexpected = ($valid !== $expected) ? ' This was unexpected!' : '';
  142. $reason = ($reason === '') ? "" : " Reason: $reason";
  144. return "The address $email is$not valid.$unexpected$reason
    \n";
  145. }

  146. // Email validator test cases (Dominic Sayers, January 2009)

  147. // Valid addresses
  148. echo unitTest('first.last@example.com');
  149. echo unitTest('1234567890123456789012345678901234567890123456789012345678901234@example.com');
  150. echo unitTest('"first last"@example.com');
  151. echo unitTest('"first\\"last"@example.com'); // Not totally sure whether this is valid or not
  152. echo unitTest('first\\@last@example.com');
  153. echo unitTest('"first@last"@example.com');
  154. echo unitTest('first\\\\last@example.com'); // Note that \ is escaped even in single-quote strings, so this is testing "first\\last"@example.com
  155. echo unitTest('first.last@x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.
  156. x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x2345');
  157. echo unitTest('first.last@[12.34.56.78]');
  158. echo unitTest('first.last@[IPv6:::12.34.56.78]');
  159. echo unitTest('first.last@[IPv6:1111:2222:3333::4444:12.34.56.78]');
  160. echo unitTest('first.last@[IPv6:1111:2222:3333:4444:5555:6666:12.34.56.78]');
  161. echo unitTest('first.last@[IPv6:::1111:2222:3333:4444:5555:6666]');
  162. echo unitTest('first.last@[IPv6:1111:2222:3333::4444:5555:6666]');
  163. echo unitTest('first.last@[IPv6:1111:2222:3333:4444:5555:6666::]');
  164. echo unitTest('first.last@[IPv6:1111:2222:3333:4444:5555:6666:7777:8888]');
  165. echo unitTest('first.last@x23456789012345678901234567890123456789012345678901234567890123.example.com');
  166. echo unitTest('first.last@1xample.com');
  167. echo unitTest('first.last@123.example.com');

  168. // Invalid addresses

  169. echo unitTest('first.last', "No @");
  170. echo unitTest('@example.com', "No local part");
  171. echo unitTest('12345678901234567890123456789012345678901234567890123456789012345@example.com', "Local part more than 64 characters");
  172. echo unitTest('.first.last@example.com', "Local part starts with a dot");
  173. echo unitTest('first.last.@example.com', "Local part ends with a dot");
  174. echo unitTest('first..last@example.com', "Local part has consecutive dots");
  175. echo unitTest('"first"last"@example.com', "Local part contains unescaped excluded characters");
  176. echo unitTest('first\\\\@last@example.com', "Local part contains unescaped excluded characters");
  177. echo unitTest('first.last@', "No domain");
  178. echo unitTest('first.last@x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.
  179. x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456789.x23456', "Domain exceeds 255 chars");
  180. echo unitTest('first.last@[.12.34.56.78]', "Only char that can precede IPv4 address is ':'");
  181. echo unitTest('first.last@[12.34.56.789]', "Can't be interpreted as IPv4 so IPv6 tag is missing");
  182. echo unitTest('first.last@[::12.34.56.78]', "IPv6 tag is missing");
  183. echo unitTest('first.last@[IPv5:::12.34.56.78]', "IPv6 tag is wrong");
  184. echo unitTest('first.last@[IPv6:1111:2222:3333::4444:5555:12.34.56.78]', "Too many IPv6 groups (4 max)");
  185. echo unitTest('first.last@[IPv6:1111:2222:3333:4444:5555:12.34.56.78]', "Not enough IPv6 groups");
  186. echo unitTest('first.last@[IPv6:1111:2222:3333:4444:5555:6666:7777:12.34.56.78]', "Too many IPv6 groups (6 max)");
  187. echo unitTest('first.last@[IPv6:1111:2222:3333:4444:5555:6666:7777]', "Not enough IPv6 groups");
  188. echo unitTest('first.last@[IPv6:1111:2222:3333:4444:5555:6666:7777:8888:9999]', "Too many IPv6 groups (8 max)");
  189. echo unitTest('first.last@[IPv6:1111:2222::3333::4444:5555:6666]', "Too many '::' (can be none or one)");
  190. echo unitTest('first.last@[IPv6:1111:2222:3333::4444:5555:6666:7777]', "Too many IPv6 groups (6 max)");
  191. echo unitTest('first.last@[IPv6:1111:2222:333x::4444:5555]', "x is not valid in an IPv6 address");
  192. echo unitTest('first.last@[IPv6:1111:2222:33333::4444:5555]', "33333 is not a valid group in an IPv6 address");
  193. echo unitTest('first.last@example.123', "TLD can't be all digits");
  194. echo unitTest('first.last@com', "Mail host must be second- or lower level");
  195. echo unitTest('first.last@-xample.com', "Label can't begin with a hyphen");
  196. echo unitTest('first.last@exampl-.com', "Label can't end with a hyphen");
  197. echo unitTest('first.last@x234567890123456789012345678901234567890123456789012345678901234.example.com', "Label can't be longer than 63 octets");

  198. // Test cases from RFC3696 (February 2004, http://tools.ietf.org/html/rfc3696#section-3)

  199. echo unitTest('Abc\\@def@example.com');
  200. echo unitTest('Fred\\ Bloggs@example.com');
  201. echo unitTest('Joe.\\\\Blow@example.com');
  202. echo unitTest('"Abc@def"@example.com');
  203. echo unitTest('"Fred Bloggs"@example.com');
  204. echo unitTest('user+mailbox@example.com');
  205. echo unitTest('customer/department=shipping@example.com');
  206. echo unitTest('$A12345@example.com');
  207. echo unitTest('!def!xyz%abc@example.com');
  208. echo unitTest('_somename@example.com');

  209. // Test cases from Doug Lovell (LinuxJournal, June 2007, http://www.linuxjournal.com/article/9585)

  210. echo unitTest("dclo@us.ibm.com");
  211. echo unitTest("abc\\@def@example.com");
  212. echo unitTest("abc\\\\@example.com");
  213. echo unitTest("Fred\\ Bloggs@example.com");
  214. echo unitTest("Joe.\\\\Blow@example.com");
  215. echo unitTest("\"Abc@def\"@example.com");
  216. echo unitTest("\"Fred Bloggs\"@example.com");
  217. echo unitTest("customer/department=shipping@example.com");
  218. echo unitTest("\$A12345@example.com");
  219. echo unitTest("!def!xyz%abc@example.com");
  220. echo unitTest("_somename@example.com");
  221. echo unitTest("user+mailbox@example.com");
  222. echo unitTest("peter.piper@example.com");
  223. echo unitTest("Doug\\ \\\"Ace\\\"\\ Lovell@example.com");
  224. echo unitTest("\"Doug \\\"Ace\\\" L.\"@example.com");
  225. echo unitTest("abc@def@example.com", "Doug Lovell says this should fail");
  226. echo unitTest("abc\\\\@def@example.com", "Doug Lovell says this should fail");
  227. echo unitTest("abc\\@example.com", "Doug Lovell says this should fail");
  228. echo unitTest("@example.com", "Doug Lovell says this should fail");
  229. echo unitTest("doug@", "Doug Lovell says this should fail");
  230. echo unitTest("\"qu@example.com", "Doug Lovell says this should fail");
  231. echo unitTest("ote\"@example.com", "Doug Lovell says this should fail");
  232. echo unitTest(".dot@example.com", "Doug Lovell says this should fail");
  233. echo unitTest("dot.@example.com", "Doug Lovell says this should fail");
  234. echo unitTest("two..dot@example.com", "Doug Lovell says this should fail");
  235. echo unitTest("\"Doug \"Ace\" L.\"@example.com", "Doug Lovell says this should fail");
  236. echo unitTest("Doug\\ \\\"Ace\\\"\\ L\\.@example.com", "Doug Lovell says this should fail");
  237. echo unitTest("hello world@example.com", "Doug Lovell says this should fail");
  238. echo unitTest("gatsby@f.sc.ot.t.f.i.tzg.era.l.d.", "Doug Lovell says this should fail");
  239. ?>
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