added php.inii

app.yaml

-runtime: php55
-api_version: 1
+runtime: php72
 
 handlers:
 # Serve images as static resources.
-- url: /(.+\.(gif|png|jpg))$
+- url: /(.+\.(gif|png|jpg|css|js))$
   static_files: \1
-  upload: .+\.(gif|png|jpg)$
-  application_readable: true
+  upload: .+\.(gif|png|jpg|css|js)$
 
 # Serve php scripts.
 - url: /.*
-  script: index.php
+  script: auto
 
 # Set bucket name
 env_variables:    

composer.json

@@ -11,7 +11,7 @@
 		"source": "https://github.com/bcit-ci/CodeIgniter"
 	},
 	"require": {
-		"php": ">=5.3.7",
+		"php": ">=7.2",
 		"google/cloud-storage": "^1.0"
 	},
 	"suggest": {

php.ini

+extensions=memcached.so
\ No newline at end of file