Lint PHP files

diff --git a/.travis.yml b/.travis.yml
new file mode 100644 (file)
index 0000000..f6f3aca
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,5 @@
+language: php
+php:
+  - '5.3'
+  - '7.1'
+script: git diff --name-only $TRAVIS_COMMIT_RANGE | grep '\.php$' | xargs -n1 -P8 php -l | grep -v 'No syntax errors'; test $? -eq 1