feat: update all runtimes to new PHP 8.1 runtime (GoogleCloudPlatform#1613)

Author: bshaffer

appengine/standard/auth/app.yaml

@@ -1,4 +1,4 @@
-runtime: php74
+runtime: php81
 
 # Defaults to "serve index.php" and "serve public/index.php". Can be used to
 # serve a custom PHP front controller (e.g. "serve backend/index.php") or to

appengine/standard/extensions/app.yaml

@@ -1 +1 @@
-runtime: php74
+runtime: php81

appengine/standard/front-controller/app.yaml

@@ -1,4 +1,4 @@
-runtime: php74
+runtime: php81
 
 # Defaults to "serve public/index.php" and "serve index.php". Can be used to
 # serve a custom PHP front controller (e.g. "serve backend/index.php") or to

appengine/standard/getting-started/app.yaml

@@ -1,7 +1,7 @@
 # See https://cloud.google.com/appengine/docs/standard/php/config/appref for a
 # complete list of `app.yaml` directives.
 
-runtime: php74
+runtime: php81
 
 env_variables:
     GOOGLE_STORAGE_BUCKET: ""

appengine/standard/grpc/index.php

@@ -8,7 +8,7 @@
 ];
 
 // Keeping things fast for a small number of routes.
-$regex = '/\/(' . join($routes, '|') . ')\.php/';
+$regex = sprintf('/\/(%s)\.php/', implode('|', $routes));
 if (preg_match($regex, $_SERVER['REQUEST_URI'], $matches)) {
     $file_path = __DIR__ . $matches[0];
     if (file_exists($file_path)) {

appengine/standard/helloworld/app.yaml

@@ -1,4 +1,4 @@
-runtime: php74
+runtime: php81
 
 # Defaults to "serve index.php" and "serve public/index.php". Can be used to
 # serve a custom PHP front controller (e.g. "serve backend/index.php") or to

appengine/standard/laravel-framework/app-dbsessions.yaml

@@ -1,4 +1,4 @@
-runtime: php74
+runtime: php81
 
 env_variables:
   ## Put production environment variables here.

appengine/standard/laravel-framework/app.yaml

@@ -1,4 +1,4 @@
-runtime: php74
+runtime: php81
 
 env_variables:
   ## Put production environment variables here.

appengine/standard/logging/app.yaml

@@ -1 +1 @@
-runtime: php74
+runtime: php81

appengine/standard/memorystore/app.yaml

@@ -1,7 +1,7 @@
 # This app.yaml is for deploying to instances of Cloud SQL running MySQL.
 # See app-postgres.yaml for running Cloud SQL with PostgreSQL.
 
-runtime: php74
+runtime: php81
 
 # [START gae_memorystore_app_yaml]
 # update with Redis instance host IP, port