diff --git a/tests/script.sh b/tests/script.sh
index ea53120..6600269 100644
--- a/tests/script.sh
+++ b/tests/script.sh
@@ -4,7 +4,21 @@ find . -type "f" -iname "*.php" | xargs -L "1" php -l
 # Run tests.
 cd tests && phpunit --configuration phpunit.xml
 
-# Check for trailing whitespace in php files.
+# Enforce line ending consistency in php files.
+crlf_file=$(find . -type "f" -iname "*.php" -exec grep --files-with-matches $'\r' {} \;)
+if [[ ! -z "${crlf_file}" ]]; then
+    echo "${crlf_file}" | perl -pe 's/(.*)/CRLF line terminators found in \1/'
+    exit 1
+fi
+
+# Enforce indentation character consistency in php files.
+tab_char=$(find . -type "f" -iname "*.php" -exec grep --line-number -H --perl-regexp "\t" {} \;)
+if [[ ! -z "${tab_char}" ]]; then
+    echo -e "${tab_char}" | perl -pe 's/^(.*)$/Tab character found in \1/'
+    exit 1
+fi
+
+# Prohibit trailing whitespace in php files.
 trailing_whitespace=$(find . -type "f" -iname "*.php" -exec egrep --line-number -H " +$" {} \;)
 if [[ ! -z "${trailing_whitespace}" ]]; then
     echo -e "${trailing_whitespace}" | perl -pe 's/^(.*)$/Trailing whitespace found in \1/'