PHP 生成UUID
public static function uuid_gen()
{
$chars = md5(uniqid(mt_rand(), true));
$uuid = substr($chars, 0, 8) . '-'
. substr($chars, 8, 4) . '-'
. substr($chars, 12, 4) . '-'
. substr($chars, 16, 4) . '-'
. substr($chars, 20, 12);
return $uuid;
}
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