Add generate_uuid() helper function

src/includes/functions.php

@@ -781,3 +781,29 @@ function timestamp2LdapDate($value, $timezone=null, $format=null) {
     return dateTime2LdapDate($datetime, $timezone, $format);
   return false;
 }
+
+/**
+ * Generate an UUID
+ * @return string
+ */
+function generate_uuid() {
+  return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
+    // 32 bits for "time_low"
+    mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
+
+    // 16 bits for "time_mid"
+    mt_rand( 0, 0xffff ),
+
+    // 16 bits for "time_hi_and_version",
+    // four most significant bits holds version number 4
+    mt_rand( 0, 0x0fff ) | 0x4000,
+
+    // 16 bits, 8 bits for "clk_seq_hi_res",
+    // 8 bits for "clk_seq_low",
+    // two most significant bits holds zero and one for variant DCE1.1
+    mt_rand( 0, 0x3fff ) | 0x8000,
+
+    // 48 bits for "node"
+    mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
+  );
+}