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PHP class implementation for Outlook's bogus proprietary thread-index for message threading
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| <?php /* | |
| encode/decode Outlook thread index. | |
| GUID must be 32 bytes long | |
| forked from brettp/thread-index.php | |
| */ | |
| abstract class outlook_thread_index { | |
| static function build($guid, $timestamp=NULL){ // create one | |
| if(strlen($guid)!=32)throw new Exception("guid is not 32 bytes"); | |
| $t = ($timestamp ? $timestamp : time() ); | |
| $ft = ($t * 10000000) + 116444736000000000; | |
| // convert to hex and 0-pad to 8 bytes | |
| $ft_hex = base_convert($ft, 10, 16); | |
| $ft_hex = str_pad($ft_hex, 16, 0, STR_PAD_LEFT); | |
| // combine first 6 bytes of timestamp with hashed guid, convert to bin, then encode | |
| $thread_ascii = substr($ft_hex, 0, 12) . $guid; | |
| $thread_bin = hex2bin($thread_ascii); | |
| $thread_enc = base64_encode($thread_bin); | |
| return $thread_enc; | |
| } | |
| static function get_guid($thread_enc){ // return GUID | |
| $thread_bin = base64_decode($thread_enc); | |
| $thread_ascii = bin2hex($thread_bin); | |
| return | |
| $guid = substr($thread_ascii,12); | |
| } | |
| } |
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