diff --git a/src/applications/differential/lipsum/PhabricatorDifferentialRevisionTestDataGenerator.php b/src/applications/differential/lipsum/PhabricatorDifferentialRevisionTestDataGenerator.php
--- a/src/applications/differential/lipsum/PhabricatorDifferentialRevisionTestDataGenerator.php
+++ b/src/applications/differential/lipsum/PhabricatorDifferentialRevisionTestDataGenerator.php
@@ -103,7 +103,7 @@
         $newcode2[] = $altcodearr[$randomlines_new[$c++]];
       }
     }
-    return implode($newcode2, "\n");
+    return implode("\n", $newcode2);
   }
 
 }
diff --git a/src/applications/people/view/PhabricatorUserCardView.php b/src/applications/people/view/PhabricatorUserCardView.php
--- a/src/applications/people/view/PhabricatorUserCardView.php
+++ b/src/applications/people/view/PhabricatorUserCardView.php
@@ -38,7 +38,7 @@
     }
 
     return array(
-      'class' => implode($classes, ' '),
+      'class' => implode(' ', $classes),
     );
   }
 
diff --git a/src/applications/project/view/PhabricatorProjectCardView.php b/src/applications/project/view/PhabricatorProjectCardView.php
--- a/src/applications/project/view/PhabricatorProjectCardView.php
+++ b/src/applications/project/view/PhabricatorProjectCardView.php
@@ -36,7 +36,7 @@
     $classes[] = 'project-card-'.$color;
 
     return array(
-      'class' => implode($classes, ' '),
+      'class' => implode(' ', $classes),
     );
   }
 
diff --git a/src/view/phui/PHUIPropertyListView.php b/src/view/phui/PHUIPropertyListView.php
--- a/src/view/phui/PHUIPropertyListView.php
+++ b/src/view/phui/PHUIPropertyListView.php
@@ -284,7 +284,7 @@
     return phutil_tag(
       'div',
       array(
-        'class' => implode($classes, ' '),
+        'class' => implode(' ', $classes),
       ),
       $part['content']);
   }
@@ -295,7 +295,7 @@
     return phutil_tag(
       'div',
       array(
-        'class' => implode($classes, ' '),
+        'class' => implode(' ', $classes),
       ),
       $part['content']);
   }
diff --git a/src/view/phui/PHUITwoColumnView.php b/src/view/phui/PHUITwoColumnView.php
--- a/src/view/phui/PHUITwoColumnView.php
+++ b/src/view/phui/PHUITwoColumnView.php
@@ -220,7 +220,7 @@
     return phutil_tag(
       'div',
       array(
-        'class' => implode($classes, ' '),
+        'class' => implode(' ', $classes),
       ),
       array(
         $navigation,