anchor.diff:  * Logs helpful warning and error messages if it detects compatibility issues with your application that require manual migration
   * Change the default web server back to Apache HTTPD. For those migrating from the previous buildpack, this will be the expected
   
  +<p class="note"><strong>WARNING:</strong> When migrating from `options.json` to `buildpack.yml`, you cannot have both files present. The Compat CNB will still run, showing what still needs to be migrated, but it will error because it cannot merge the two files.</p>
  +
   ## <a id='migrations'></a> Manual Migrations ##
   
   Depending on your application, you may need to make some manual migrations. The following migrations cannot be done by the Compat CNB, so they require manual configuration.
  +
  +<p class="note"><strong>Note:</strong> The following sections use a dot notation to reference configuration options from buildpack.yml. This should be expanded into valid YAML syntax. See <a href="php-config.html#options">the buildpack.yml configuration options section for details</a>.</p>
   
   ### <a id='buildpack_extensions'></a> Buildpack Extensions ###
   
  
positive.code:       * is now expected under the application root by default, not under the library directory
    * The files `composer.json`, `composer.lock` and/or `auth.json` are no longer moved. This caused confusion.  If you need them in a specific location, put them there prior to pushing your code. You can also set `composer.json_path` to adjust where the buildpack finds these files. Lastly, if you leave the in a public directory, the buildpack will emit a warning as this isn't safe.
    * You can no longer set `COMPOSER_BIN_DIR` or `COMPOSER_CACHE_DIR`. They are automatically set by the CNB such that `COMPOSER_BIN_DIR` will be on the `PATH` and such that files will be correctly cached to reduce downloads and speed up builds.
  * The default web server used by the PHP Cloud-Native Buildpack is PHP's built-in web server. This is lighter weight and produces smaller images.
  
  ## <a id='compat_cnb'></a> PHP Compat Cloud-Native Buildpack ##
  
  
negative.code: 
  2. In `buildpack.yml`, set `php.web_directory` to point to an existing directory where you store your public files.
  
  ### <a id='composer_vendor_dir'></a> Composer Vendor Directory No Longer Moved ###
  
  There have been a couple changes with respect to Composer's handing of the `vendor` directory.
  
  1. The previous buildpack would put Composer's `vendor` directory on PHP's `include_path` by default. Users reported this as unexpected and adding additional directories to the `include_path` can slow down PHP, so this behavior was changed.<br/><br/>
  
      If you would like to have the `vendor` directory on the `include_path` then you can set `php.libdirectory` in `buildpack.yml` to the location of your `vendor` directory. The `php.libdirectory` is added to the `include_path` by default, so this will cause your `vendor` directory to be on the `include_path`.<br/><br/>
  
      Alternatively, you could include a `php.ini` snippet that adjusts the `include_path` directly, but you need to be very careful as this will completely override the default set by the buildpack.
  
  2. Composer's `vendor` directory is no longer moved. Previously, it was moved into the `php.libdirectory`. Moving this folder broke some apps which expected the vendor directory to be in a specific location. As such, we no longer move the `vendor` directory. It will exist where you put it. If you need it in a specific place, just locate it there.
  
  3. Composer now defaults the `vendor` directory to be under the application root instead of the `php.libdirectory`. This change was made because it is inline with the default behavior we see with frameworks like Cake & Symfony, so more applications will "just work" without additional configuration required.<br/><br/>
  
      If you prefer the old behavior, you can change it back by setting `composer.vendor_directory` in `buildpack.yml` to point to a location under the `php.libdirectory` folder.
  
  