This is an email encrypt / decrypt extracted from TYPO3. It is useful to protecting your email against spam bots.
| <?php | |
| $email = 'software@insanitymeetshh.net'; | |
| $emailEncode = quoteJSvalue(encryptEmail($email, '-2')); | |
| function quoteJSvalue($value) { | |
| return strtr( | |
| json_encode((string)$value, JSON_HEX_AMP|JSON_HEX_APOS|JSON_HEX_QUOT|JSON_HEX_TAG), | |
| [ | |
| '"' => '\'', | |
| '\\\\' => '\\u005C', | |
| ' ' => '\\u0020', | |
| '!' => '\\u0021', | |
| '\\t' => '\\u0009', | |
| '\\n' => '\\u000A', | |
| '\\r' => '\\u000D' | |
| ] | |
| ); | |
| } | |
| function encryptCharcode($n, $start, $end, $offset) { | |
| $n = $n + $offset; | |
| if ($offset > 0 && $n > $end) { | |
| $n = $start + ($n - $end - 1); | |
| } elseif ($offset < 0 && $n < $start) { | |
| $n = $end - ($start - $n - 1); | |
| } | |
| return chr($n); | |
| } | |
| function encryptEmail($string, $type) { | |
| $out = ''; | |
| // obfuscates using the decimal HTML entity references for each character | |
| if ($type === 'ascii') { | |
| $stringLength = strlen($string); | |
| for ($a = 0; $a < $stringLength; $a++) { | |
| $out .= '&#' . ord(substr($string, $a, 1)) . ';'; | |
| } | |
| } else { | |
| // like str_rot13() but with a variable offset and a wider character range | |
| $len = strlen($string); | |
| $offset = (int)$type; | |
| for ($i = 0; $i < $len; $i++) { | |
| $charValue = ord($string[$i]); | |
| // 0-9 . , - + / : | |
| if ($charValue >= 43 && $charValue <= 58) { | |
| $out .= encryptCharcode($charValue, 43, 58, $offset); | |
| } elseif ($charValue >= 64 && $charValue <= 90) { | |
| // A-Z @ | |
| $out .= encryptCharcode($charValue, 64, 90, $offset); | |
| } elseif ($charValue >= 97 && $charValue <= 122) { | |
| // a-z | |
| $out .= encryptCharcode($charValue, 97, 122, $offset); | |
| } else { | |
| $out .= $string[$i]; | |
| } | |
| } | |
| } | |
| return $out; | |
| } | |
| ?> | |
| <html> | |
| <head> | |
| <script type="text/javascript"> | |
| /*<![CDATA[*/ | |
| /*_scriptCode*/ | |
| // decrypt helper function | |
| function decryptCharcode(n,start,end,offset) { | |
| n = n + offset; | |
| if (offset > 0 && n > end) { | |
| n = start + (n - end - 1); | |
| } else if (offset < 0 && n < start) { | |
| n = end - (start - n - 1); | |
| } | |
| return String.fromCharCode(n); | |
| } | |
| // decrypt string | |
| function decryptString(enc,offset) { | |
| var dec = ""; | |
| var len = enc.length; | |
| for(var i=0; i < len; i++) { | |
| var n = enc.charCodeAt(i); | |
| if (n >= 0x2B && n <= 0x3A) { | |
| dec += decryptCharcode(n,0x2B,0x3A,offset); // 0-9 . , - + / : | |
| } else if (n >= 0x40 && n <= 0x5A) { | |
| dec += decryptCharcode(n,0x40,0x5A,offset); // A-Z @ | |
| } else if (n >= 0x61 && n <= 0x7A) { | |
| dec += decryptCharcode(n,0x61,0x7A,offset); // a-z | |
| } else { | |
| dec += enc.charAt(i); | |
| } | |
| } | |
| return dec; | |
| } | |
| // decrypt spam-protected emails | |
| function linkTo_UnCryptMailto(s) { | |
| location.href = 'mailto:' + decryptString(s,2); | |
| //alert(decryptString(s,2)); | |
| } | |
| /*]]>*/ | |
| </script> | |
| </head> | |
| <body> | |
| <?php echo $email . '<br/>'; ?> | |
| <?php echo '<a href="javascript:linkTo_UnCryptMailto(' . $emailEncode . ');">' . $emailEncode . '</a>'; ?> | |
| </body> | |
| </html> |
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