Update build.sh
diff --git a/lang/php/build.sh b/lang/php/build.sh
index 54f7546..6ce536f 100755
--- a/lang/php/build.sh
+++ b/lang/php/build.sh
@@ -57,7 +57,7 @@
       ;;
 
     lint)
-      echo 'This is a stub where someone can provide linting.'
+      find . -name "*.php" -print0 | xargs -0 -n1 -P8 php -l
       ;;
 
     test)