diff --git a/src/applications/auth/management/PhabricatorAuthManagementRevokeWorkflow.php b/src/applications/auth/management/PhabricatorAuthManagementRevokeWorkflow.php
index f2a9e35688..efcd115291 100644
--- a/src/applications/auth/management/PhabricatorAuthManagementRevokeWorkflow.php
+++ b/src/applications/auth/management/PhabricatorAuthManagementRevokeWorkflow.php
@@ -71,7 +71,7 @@ final class PhabricatorAuthManagementRevokeWorkflow
             '"--everything". Use "--list" to list available credential '.
             'types.'));
       }
-    } else if (strlen($type) && $is_everything) {
+    } else if (phutil_nonempty_string($type) && $is_everything) {
       throw new PhutilArgumentUsageException(
         pht(
           'Specify the credential type to revoke with "--type" or '.
@@ -119,12 +119,12 @@ final class PhabricatorAuthManagementRevokeWorkflow
     }
 
     $target = null;
-    if (!strlen($from) && !$is_everywhere) {
+    if (!phutil_nonempty_string($from) && !$is_everywhere) {
       throw new PhutilArgumentUsageException(
         pht(
           'Specify the target to revoke credentials from with "--from" or '.
           'specify "--everywhere".'));
-    } else if (strlen($from) && $is_everywhere) {
+    } else if (phutil_nonempty_string($from) && $is_everywhere) {
       throw new PhutilArgumentUsageException(
         pht(
           'Specify the target to revoke credentials from with "--from" or '.