wp import/export combined with serialized data is really a pickle, ad…

…ded fix for corrupted serialized data, one particular cause during export is the conversion of "\r\n" to "\n" which offsets the string lengths (corrupting the serialized data), import function now attempts to recalculate the string lengths

wp-content/wpalchemy/MetaBox.php

@@ -5,7 +5,7 @@
  * @copyright	Copyright (c) 2009, Dimas Begunoff, http://farinspace.com
  * @license		http://en.wikipedia.org/wiki/MIT_License The MIT License
  * @package		WPAlchemy
- * @version		1.5
+ * @version		1.5.1
  * @link		http://github.com/farinspace/wpalchemy
  * @link		http://farinspace.com
  */
@@ -510,7 +510,9 @@ function WPAlchemy_MetaBox($arr)
 	}
 
 	/**
-	 * Used to correct double serialized data during post/page export/import
+	 * Used to correct double serialized data during post/page export/import,
+	 * additionally will try to fix corrupted serialized data by recalculating
+	 * string length values
 	 *
 	 * @since	1.3.16
 	 * @access	private
@@ -519,8 +521,29 @@ function _import($post_id, $key, $value)
 	{
 		if (WPALCHEMY_MODE_ARRAY == $this->mode AND $key == $this->id)
 		{
-			// maybe_unserialize fixes a wordpress bug which double serializes already serialized data during export/import
-			update_post_meta($post_id, $key, maybe_unserialize(stripslashes($value)));
+			// using $wp_import to get access to the raw postmeta data prior to it getting passed
+			// through "maybe_unserialize()" in "plugins/wordpress-importer/wordpress-importer.php"
+			// the "import_post_meta" action is called after "maybe_unserialize()"
+
+			global $wp_import;
+
+			foreach ( $wp_import->posts as $post )
+			{
+				if ( $post_id == $post['post_id'] )
+				{
+					foreach( $post['postmeta'] as $meta )
+					{
+						if ( $key == $meta['key'] )
+						{
+							// try to fix corrupted serialized data, specifically "\r\n" being converted to "\n" during wordpress XML export (WXR)
+							// "maybe_unserialize()" fixes a wordpress bug which double serializes already serialized data during export/import
+							$value = maybe_unserialize( preg_replace( '!s:(\d+):"(.*?)";!es', "'s:'.strlen('$2').':\"$2\";'", stripslashes( $meta['value'] ) ) );
+
+							update_post_meta( $post_id, $key,  $value );
+						}
+					}
+				}
+			}
 		}
 	}