diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 22ba8e8b..1fd7b24a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,24 +1,39 @@
-image: tetraweb/php
-
 stages:
   - test
   - deploy
 
 before_script:
+  - bash ci/docker_install.sh > /dev/null
   - cd api
   - php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
   - php composer-setup.php
   - php -r "unlink('composer-setup.php');"
   - php composer.phar update
 
-test:
+test:7.1:
+  image: php:7.1
   stage: test
   script:
     - composer install
     - cd Tests
     - phpunit
+    - cd ../../
+    - bash ci/php_lint.sh ./
+
+test:7.0:
+  image: php:7.0
+  stage: test
+  script:
+    - bash ci/php_lint.sh ./
+
+test:5.5:
+  image: php:5.5
+  stage: test
+  script:
+    - bash ci/php_lint.sh ./
 
 deploy:
+  image: tetraweb/php
   when: manual
   stage: deploy
   script:
diff --git a/ci/php_lint.sh b/ci/php_lint.sh
new file mode 100644
index 00000000..1e0c3ad1
--- /dev/null
+++ b/ci/php_lint.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+error=false
+
+while test $# -gt 0; do
+    current=$1
+    shift
+
+    if [ ! -d $current ] && [ ! -f $current ] ; then
+        echo "Invalid directory or file: $current"
+        error=true
+
+        continue
+    fi
+
+    for file in `find $current -type f -not -path "*vendor/*" -name "*.php"` ; do
+        RESULTS=`php -l $file`
+		echo $RESULTS
+
+        if [ "$RESULTS" != "No syntax errors detected in $file" ] ; then
+            echo $RESULTS
+            error=true
+        fi
+    done
+done
+
+
+if [ "$error" = true ] ; then
+    exit 1
+else
+    exit 0
+fi
+
+