Add rudimentary PHP syntax checking (#5)

.travis.yml

@@ -0,0 +1,14 @@
+language: php
+php:
+- 5.4
+- 5.5
+- 5.6
+- 7.0
+- 7.1
+- 7.2
+- hhvm
+matrix:
+  allow_failures:
+  - php: hhvm
+script:
+- bin/check-syntax.sh

bin/check-syntax.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+PHP='/usr/bin/env php'
+RETURN=0
+
+# check PHP files
+for FILE in `find config-templates hooks lib templates www -name "*.php"`; do
+    $PHP -l $FILE > /dev/null 2>&1
+    if [ $? -ne 0 ]; then
+        echo "Syntax check failed for ${FILE}"
+        RETURN=`expr ${RETURN} + 1`
+    fi
+done
+
+exit $RETURN