Include WordPress Core into own Scripts

3 comments

1. Short answer, do this:

   define('WP_USE_THEMES', false);
   global $wp, $wp_query, $wp_the_query, $wp_rewrite, $wp_did_header;
   require(BASE_PATH . 'wp-load.php');
   

   Long answer, it’s a subtle gotcha around importing scripts with PHP.

   If you define a local variable, outside of all functions, then it can be retrieved inside a function using ‘global’. If you have a local variable inside a function, it cannot be retrieved later using global, unless it is defined as being global there and then.

   The script ‘wp-settings.php’ is where the issue lies. It is included via your call to include ‘wp-load.php’.

   The variables defined there are not stated as being global; instead this is presumed because the script is always run outside of any functions, and so are automatically global. i.e.

   $wordpress = 'foo';
   
   function wordpressFunction() {
       global $wordpress;
   }
   

   Because you are importing the script within a function, they now become local variables. You are essentially doing:

   function myFramework() {
       $wordpress = 'foo';
   
       function wordpressFunction() {
           global $wordpress;
       }
   }
   

   So the fix is to define them as global yourself before importing the script. Now $wp_query, and the others defined as global, are correctly found.

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2. The easiest way to access everything wordpress has programmed in is to use the following:

   require_once('/../../../wp-blog-header.php'); // Use actual root path to wp-blog-header.php
   header("HTTP/1.0 200 OK");
   

   Using the above code you’ll get all functions you would normally get using a template with in WordPress. I’ve tried all the other methods listed above and this one is by far the best.

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3. I had the same error. I wanted to get some articles along with permalinks. This helped:

   global $wpdb, $wp_rewrite;
   require '/(...)/wp-config.php';
   
   $result = $wpdb->get_results( $wpdb->prepare( ... ) );
   foreach( $result as &$item )
     $item->link = get_permalink( $item->ID );
   

   I also found this useful in another case:
   http://www.stormyfrog.com/using-wpdb-outside-wordpress/

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