PHP?? ??? v4 UUID ??
PHP?? ??? v4 UUID? ???? ?? ??? ??? ???? ?? ??? ? ????. UUID(Universally Unique Identifier)? "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx"?? ?? ??? ???? ???. ??? "y"? 8, 9, A ?? B? ?????.
?? ??? ? ??
??? ??? ? ??? UUID? ?? ??? ???? ??? ???? ????. ? ??? ?? ??. ??? "y" ?? ???? ???? ????.
?? ??
? ??? ????? ??? ???? ?? ?? ??? ?? ???. . RFC 4122 - ?? 4.4? ??? ?? ??? ??? ?????.
- time_hi_and_version(7?? ??? ?? 4-7)
- clock_seq_hi_and_reserved(9?? ??? ?? 6 ? 7) ??)
????? ??
??? ??? v4 UUID? ???? ????? PHP ?????.
function uuidv4()
{
$data = random_bytes(16);
$data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100
$data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10
return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
}
?? ?? ???
????? ??? ??? ???? ?? openssl_random_pseudo_bytes() ?? random_bytes()(PHP 7 ??)? ???? ?? ????. ?? PHP ??? ?? openssl_random_pseudo_bytes()? ??? ? ????.
? ??? PHP?? ??? v4 UUID? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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