Author Archives: Jimmy Berry

Upcoming changes in App Engine 1.9.0 for SCRIPT_NAME and PHP_SELF

The implementation of $_SERVER[‘SCRIPT_NAME’] and $_SERVER[‘PHP_SELF’] prior to 1.9.0 differs significantly from 1.9.0 and onward. The changes were made to be consistent with the Apache implementation generally expected by PHP applications.

The following examples demonstrate the difference.

<= 1.8.9 >= 1.9.0
app.yaml:
- url: /.*
  script: index.php
REQUEST_URI: /
SCRIPT_FILENAME: /path/to/index.php
SCRIPT_NAME: /
PHP_SELF: /
REQUEST_URI: /
SCRIPT_FILENAME: /path/to/index.php
SCRIPT_NAME: /index.php
PHP_SELF: /index.php
REQUEST_URI: /bar
SCRIPT_FILENAME: /path/to/index.php
SCRIPT_NAME: /bar
PHP_SELF: /bar
REQUEST_URI: /bar
SCRIPT_FILENAME: /path/to/index.php
SCRIPT_NAME: /index.php
PHP_SELF: /index.php
REQUEST_URI: /index.php/foo/bar
SCRIPT_FILENAME: /path/to/index.php
SCRIPT_NAME: /index.php/foo/bar
PHP_SELF: /index.php/foo/bar
REQUEST_URI: /index.php/foo/bar
SCRIPT_FILENAME: /path/to/index.php
SCRIPT_NAME: /index.php
PHP_SELF: /index.php/foo/bar
REQUEST_URI: /test.php/foo/bar
SCRIPT_FILENAME: /path/to/index.php
SCRIPT_NAME: /test.php/foo/bar
PHP_SELF: /test.php/foo/bar
REQUEST_URI: /test.php/foo/bar
SCRIPT_FILENAME: /path/to/index.php
SCRIPT_NAME: /index.php
PHP_SELF: /index.php
app.yaml:
- url: /.*
  script: foo/index.php
REQUEST_URI: /bar
SCRIPT_FILENAME: /path/to/foo/index.php
SCRIPT_NAME: /bar
PHP_SELF: /bar
REQUEST_URI: /bar
SCRIPT_FILENAME: /path/to/foo/index.php
SCRIPT_NAME: /foo/index.php
PHP_SELF: /foo/index.php

Note the odd behavior of PHP_SELF which is consistent with PHP on Apache.

Many frameworks and applications depend on SCRIPT_NAME to determine if the application is running within a subdirectory, typically within an Apache virtual host, and as such will not be affected by this change. On the other hand this may break custom applications or frameworks that have been configured to work with the previous implementation.