生成唯一编号

app/Helpers/functions.php

@@ -297,6 +297,8 @@ function generateRandomNum( $len = 32, $md5 = true ) {
     # Create random token at the specified length
     for ( $i=0; $i<$len; $i++ )
         $token .= $chars[ mt_rand(0, $numChars) ];
+
+    $time = microtime(true);
     # Should token be run through md5?
     if ( $md5 ) {
         # Number of 32 char chunks
@@ -305,8 +307,9 @@ function generateRandomNum( $len = 32, $md5 = true ) {
         for ( $i=1; $i<=$chunks; $i++ )
             $md5token .= md5( substr($token, $i * 32 - 32, 32) );
         # Trim the token
-        $token = substr($md5token, 0, $len);
+        $token = md5($time.substr($md5token, 0, $len));
     }
+
     return $token;
 }