diff --git a/app/common.php b/app/common.php
index 757f4b3..8f7f5b5 100644
--- a/app/common.php
+++ b/app/common.php
@@ -135,4 +135,38 @@ function throwError(string $message, ?int $status = null, array $data = [])
 {
     is_null($status) && $status = config('status.error');
     throw new BaseException(['status' => $status, 'message' => $message, 'data' => $data]);
+}
+
+/**
+ * 获取全局唯一标识符
+ * @param bool $trim
+ * @return string
+ */
+function get_guid_v4(bool $trim = true): string
+{
+    // Windows
+    if (function_exists('com_create_guid') === true) {
+        $charid = com_create_guid();
+        return $trim ? trim($charid, '{}') : $charid;
+    }
+    // OSX/Linux
+    if (function_exists('openssl_random_pseudo_bytes') === true) {
+        $data = openssl_random_pseudo_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));
+    }
+    // Fallback (PHP 4.2+)
+    mt_srand(intval((double)microtime() * 10000));
+    $charid = strtolower(md5(uniqid((string)rand(), true)));
+    $hyphen = chr(45);                  // "-"
+    $lbrace = $trim ? "" : chr(123);    // "{"
+    $rbrace = $trim ? "" : chr(125);    // "}"
+    return $lbrace .
+        substr($charid, 0, 8) . $hyphen .
+        substr($charid, 8, 4) . $hyphen .
+        substr($charid, 12, 4) . $hyphen .
+        substr($charid, 16, 4) . $hyphen .
+        substr($charid, 20, 12) .
+        $rbrace;
 }
\ No newline at end of file