inc/EmailAddressValidator.php

   1 <?php
   2 /**
   3  * EmailAddressValidator Class
   4  *
   5  * @author  Dave Child <dave@addedbytes.com>
   6  * @link    http://code.google.com/p/php-email-address-validation/
   7  * @license http://www.opensource.org/licenses/bsd-license.php
   8  */
   9 class EmailAddressValidator {
  10
  11     /**
  12      * Check email address validity
  13      * @param   strEmailAddress     Email address to be checked
  14      * @return  True if email is valid, false if not
  15      */
  16     function check_email_address($strEmailAddress) {
  17
  18         // Control characters are not allowed
  19         if (preg_match('/[\x00-\x1F\x7F-\xFF]/', $strEmailAddress)) {
  20             return false;
  21         }
  22
  23         // Split it into sections using last instance of "@"
  24         $intAtSymbol = strrpos($strEmailAddress, '@');
  25         if ($intAtSymbol === false) {
  26             // No "@" symbol in email.
  27             return false;
  28         }
  29         $arrEmailAddress[0] = substr($strEmailAddress, 0, $intAtSymbol);
  30         $arrEmailAddress[1] = substr($strEmailAddress, $intAtSymbol + 1);
  31
  32         // Count the "@" symbols. Only one is allowed, except where
  33         // contained in quote marks in the local part. Quickest way to
  34         // check this is to remove anything in quotes.
  35         $arrTempAddress[0] = preg_replace('/"[^"]+"/'
  36                                          ,''
  37                                          ,$arrEmailAddress[0]);
  38         $arrTempAddress[1] = $arrEmailAddress[1];
  39         $strTempAddress = $arrTempAddress[0] . $arrTempAddress[1];
  40         // Then check - should be no "@" symbols.
  41         if (strrpos($strTempAddress, '@') !== false) {
  42             // "@" symbol found
  43             return false;
  44         }
  45
  46         // Check local portion
  47         if (!$this->check_local_portion($arrEmailAddress[0])) {
  48             return false;
  49         }
  50
  51         // Check domain portion
  52         if (!$this->check_domain_portion($arrEmailAddress[1])) {
  53             return false;
  54         }
  55
  56         // If we're still here, all checks above passed. Email is valid.
  57         return true;
  58
  59     }
  60
  61     /**
  62      * Checks email section before "@" symbol for validity
  63      * @param   strLocalPortion     Text to be checked
  64      * @return  True if local portion is valid, false if not
  65      */
  66     function check_local_portion($strLocalPortion) {
  67         // Local portion can only be from 1 to 64 characters, inclusive.
  68         // Please note that servers are encouraged to accept longer local
  69         // parts than 64 characters.
  70         if (!$this->check_text_length($strLocalPortion, 1, 64)) {
  71             return false;
  72         }
  73         // Local portion must be:
  74         // 1) a dot-atom (strings separated by periods)
  75         // 2) a quoted string
  76         // 3) an obsolete format string (combination of the above)
  77         $arrLocalPortion = explode('.', $strLocalPortion);
  78         for ($i = 0, $max = sizeof($arrLocalPortion); $i < $max; $i++) {
  79              if (!preg_match('.^('
  80                             .    '([A-Za-z0-9!#$%&\'*+/=?^_`{|}~-]'
  81                             .    '[A-Za-z0-9!#$%&\'*+/=?^_`{|}~-]{0,63})'
  82                             .'|'
  83                             .    '("[^\\\"]{0,62}")'
  84                             .')$.'
  85                             ,$arrLocalPortion[$i])) {
  86                 return false;
  87             }
  88         }
  89         return true;
  90     }
  91
  92     /**
  93      * Checks email section after "@" symbol for validity
  94      * @param   strDomainPortion     Text to be checked
  95      * @return  True if domain portion is valid, false if not
  96      */
  97     function check_domain_portion($strDomainPortion) {
  98         // Total domain can only be from 1 to 255 characters, inclusive
  99         if (!$this->check_text_length($strDomainPortion, 1, 255)) {
 100             return false;
 101         }
 102         // Check if domain is IP, possibly enclosed in square brackets.
 103         if (preg_match('/^(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])'
 104            .'(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}$/'
 105            ,$strDomainPortion) ||
 106             preg_match('/^\[(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])'
 107            .'(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}\]$/'
 108            ,$strDomainPortion)) {
 109             return true;
 110         } else {
 111             $arrDomainPortion = explode('.', $strDomainPortion);
 112             if (sizeof($arrDomainPortion) < 2) {
 113                 return false; // Not enough parts to domain
 114             }
 115             for ($i = 0, $max = sizeof($arrDomainPortion); $i < $max; $i++) {
 116                 // Each portion must be between 1 and 63 characters, inclusive
 117                 if (!$this->check_text_length($arrDomainPortion[$i], 1, 63)) {
 118                     return false;
 119                 }
 120                 if (!preg_match('/^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|'
 121                    .'([A-Za-z0-9]+))$/', $arrDomainPortion[$i])) {
 122                     return false;
 123                 }
 124             }
 125         }
 126         return true;
 127     }
 128
 129     /**
 130      * Check given text length is between defined bounds
 131      * @param   strText     Text to be checked
 132      * @param   intMinimum  Minimum acceptable length
 133      * @param   intMaximum  Maximum acceptable length
 134      * @return  True if string is within bounds (inclusive), false if not
 135      */
 136     function check_text_length($strText, $intMinimum, $intMaximum) {
 137         // Minimum and maximum are both inclusive
 138         $intTextLength = strlen($strText);
 139         if (($intTextLength < $intMinimum) || ($intTextLength > $intMaximum)) {
 140             return false;
 141         } else {
 142             return true;
 143         }
 144     }
 145 }
 146