Title: code file inclusion question.
Last modified: August 31, 2016

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# code file inclusion question.

 *  Resolved [idono](https://wordpress.org/support/users/idono/)
 * (@idono)
 * [10 years ago](https://wordpress.org/support/topic/code-file-inclusion-question/)
 * Hi.
 * I have a verry basic question about codefile inclusion when it comes to PHP.
   
   Is it common to only include extra files, like the facebook api, only when they
   are needed?
 * Simply put i encountered a problem where another plugin is importing an earlier
   version of the Facebook API and i’m trying to use a newer version. I’ve tried
   exploring different venues but the only conclusion i can come to is to rewrite
   the plugin i’m using slightly to only load the facebook API when it needs to 
   use it.

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [Jay](https://wordpress.org/support/users/phyrax/)
 * (@phyrax)
 * [10 years ago](https://wordpress.org/support/topic/code-file-inclusion-question/#post-7407762)
 * Typically when working with things such as API’s it’s great to use things like`
   function_exists()` and `class_exists()` checks to allow future dev’s to overwrite
   these at a later date.
 * This allows future developers to overwrite the file entirely, thus, upgrading
   the API or downgrading in some cases.
 * With that being said, though I’ve never used this, you could look into `override_function()`
   and `rename_function()`
 * [http://stackoverflow.com/questions/15230883/how-to-override-built-in-php-functions](http://stackoverflow.com/questions/15230883/how-to-override-built-in-php-functions)
 *  Thread Starter [idono](https://wordpress.org/support/users/idono/)
 * (@idono)
 * [10 years ago](https://wordpress.org/support/topic/code-file-inclusion-question/#post-7407819)
 * Thx for the input. I solved it in another way. I ended up changing some lines
   in facebooks **autoloader.php** file instead. I was on the right track from before
   i asked the question. Just got a bit blinded by frustration and forgot to change
   all the parts.
 * Also i meant codefile inclusion in wordpress and not php. I’m meticulous about
   not including API files and constants when they aren’t needed. But that doesn’t
   seem to be all that common with the plugins i’m using. Wich is a bit worrying.
 * For those that are interested. If you have dependency issues with the facebook
   API where the error states that it can’t find the class. It could be because 
   someone is hogging the **FACEBOOK_SDK_V4_SRD_DIR** constant. So check if the 
   constant has been defined. If it has then you can do 1 out of 3 things. Disable
   the plugin hogging the constant. But that’s hardly an option.
 * In the second approach. Find this part in Facebooks **autoload.php** file.
 *     ```
       // For backwards compatibility
          $customBaseDir = '';
          //@todo v6: Remove support for 'FACEBOOK_SDK_V4_SRC_DIR'
          if (defined('FACEBOOK_SDK_V4_SRC_DIR')) {
               $customBaseDir = FACEBOOK_SDK_V4_SRC_DIR;
           } elseif (defined('FACEBOOK_SDK_SRC_DIR')) {
               $customBaseDir = FACEBOOK_SDK_SRC_DIR;
           }
           // base directory for the namespace prefix
           $baseDir = $customBaseDir ?: __DIR__ . '/';
       ```
   
 * And change the **FACEBOOK_SDK_V4_SRC_DIR** and **FACEBOOK_SDK_SRC_DIR** constants
   to something that is guaranteed to be unique for your plugin.
 *     ```
       // For backwards compatibility
          $customBaseDir = '';
          //@todo v6: Remove support for 'FACEBOOK_SDK_V4_SRC_DIR'
          if (defined('FBAF_FACEBOOK_SDK_V4_SRC_DIR')) {
               $customBaseDir = FBAF_FACEBOOK_SDK_V4_SRC_DIR;
           } elseif (defined('FBAF_FACEBOOK_SDK_SRC_DIR')) {
               $customBaseDir = FBAF_FACEBOOK_SDK_SRC_DIR;
           }
           // base directory for the namespace prefix
           $baseDir = $customBaseDir ?: __DIR__ . '/';
       ```
   
 * In my case i just prefixed the constants with **FBAF_**
 * Third option is to comment out the entire **if/else ** statement. Based on the
   todo tag. Support for the src dir constant will be removed completly in version
   6 of the api.
 * I strongly recommend option 2.
 * Edit: I spoke to soon. But it fixes the problem of not finding some of the classes
   in V5.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘code file inclusion question.’ is closed to new replies.

 * In: [Hacks](https://wordpress.org/support/forum/plugins-and-hacks/hacks/)
 * 2 replies
 * 2 participants
 * Last reply from: [idono](https://wordpress.org/support/users/idono/)
 * Last activity: [10 years ago](https://wordpress.org/support/topic/code-file-inclusion-question/#post-7407819)
 * Status: resolved

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