[Uid] work around slow generation of v4 UUIDs

symfony · Mar 15, 2020 · baac8f0 · baac8f0
1 parent 6f2d9b6
commit baac8f0
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/UuidV4.php b/UuidV4.php
@@ -25,7 +25,12 @@ class UuidV4 extends Uuid
     public function __construct(string $uuid = null)
     {
         if (null === $uuid) {
-            $this->uuid = uuid_create(static::TYPE);
+            $uuid = random_bytes(16);
+            $uuid[6] = $uuid[6] & "\x0F" | "\x4F";
+            $uuid[8] = $uuid[8] & "\x3F" | "\x80";
+            $uuid = bin2hex($uuid);
+
+            $this->uuid = substr($uuid, 0, 8).'-'.substr($uuid, 8, 4).'-'.substr($uuid, 12, 4).'-'.substr($uuid, 16, 4).'-'.substr($uuid, 20, 12);
         } else {
             parent::__construct($uuid);
         }