理解zencart系统文件替换机制（Understanding the Override System ）

• The Override System Simplified.
  
  The Override System includes:
  

      Language Files: includes/languages
      Module Files: includes/modules
      Template Files: includes/templates/template_default
      Extra Definitions: includes/languages/ENGLISH/extra_definitions
      Extra Data Files: includes/extra_datafiles

  
  CAPITALIZED words refer to a folder or language that you choose. This article uses /CUSTOM for your template and ENGLISH for your language. Use your own name wherever you see /CUSTOM.
  
  Note: be sure to read How do I create a new Custom Template?
  
  Remember only files which have been modified should be copied to your /CUSTOM directory. If you do not make modifications, then by default, Zen Cart® will use the default file.
  
  Language Files
  

  • Global information: /includes/languages/english.php

      Suppose you want to change the Heading of your Categories sidebox.
      Create a new directory: /includes/languages/CUSTOM
      Copy english.php to this new directory
      You now have /includes/languages/CUSTOM/english.php
      Open the file in a text editor find and modify the following line of code
      define('BOX_HEADING_CATEGORIES', 'Categories');
      Save the file and upload your new directory and its contents to your server.

  • Page Specific information: /includes/languages/ENGLISH/*.php (all files within this directory)

      You need to modify some text in account.php - Let's say you want to change every instance of the word 'Account' to     'Profile'
      Create a new directory: /includes/languages/ENGLISH/CUSTOM
      Copy account.php to this new directory
      You now have /includes/languages/ENGLISH/CUSTOM/account.php
      Open the file in a text editor find and modify the following line of code
      define('MY_ACCOUNT_TITLE', 'My Account');
      Save the file and upload your new directory and its contents to your server.

  Module Files
  

  • Sideboxes information: /includes/modules/sideboxes/*.php

      You need to modify sidebox information.php to include another link.
      Create a new directory: /includes/modules/sideboxes/CUSTOM
      Copy information.php to this new folder
      You now have /includes/modules/sideboxes/CUSTOM/information.php
      Open the file in a text editor and modify it to suit your needs
      Save the file and upload your new directory and its contents to your server.

  
  Template Files
  

  • Page templates: /includes/templates/template_default/templates/tpl_***.php

      You need to modify some part of  tpl_account_default.php
      You should already have the following folder structure /includes/templates/CUSTOM/templates.
      Copy tpl_account_default.php to this directory.
      Open the file in a text editor find modify it to suit your needs
      Save the file and upload it to your server.

  • Sidebox templates: /includes/templates/sideboxes/tpl_***.php

  To modify these files follow the steps above, with the exception of the sidebox path.

  
  Create Your Own Definitions
  

      As you customize your cart, you may find that you need to include additional definitions.
      You can do this by using your text editor to create a definition file - your_definition_file.php.
      All the definitions you need for your customization would be included in this file.
      Save the file to includes/languages/ENGLISH/extra_definitions/your_definition_file.php and upload it to your server

  Note: files in this directory get loaded automatically, ensuring your custom definitions can be used throughout your cart.
  
  Extra Data Files
  

  • Custom file names - /includes/filenames.php

      You've created a custom page (about_us) and need to reference the filename.
      Create a new file (about_us_filenames.php) which would include the following:
      <?php
      // About Us Filename Define
      define('FILENAME_ABOUT_US', 'about_us');
      ?>
      Save the file to /includes/extra_datafiles/about_us_filenames.php and upload it to your server.

  Note: These files will be called automatically, as would any other file in this directory, thereby telling the system what your custom filenames are.
  
  Custom Database Tables
  

      You've created a new database field for your UPS tracking system, ups_track and need to define the table name for your code.
      Create a new file (ups_track_database_tables.php) which would include the following:
  <?php
  // UPS Tracking Table
  define ('TABLE_UPS_TRACK', 'ups_track');
  ?>
  Save the file to /includes/extra_datafiles/usps_track_database_tables.php and upload it to your server.

  Note: These files will be called automatically, as would any other file in this directory, thereby telling the system what your custom filenames are.
  
  Extra Javascript for an existing file
  

      You need to load some javascript for your bizrate account, so that it loads from the existing page (checkout_success.php) after the order has completed.
      Create a new file named jscript_bizrate.js which would include the following:
  <script language="javascript" type="text/javascript"><!--
  whatever the heck bizrate gave you
  //--></script> 
  
  Save the file to /includes/modules/pages/checkout_success and upload it to your server.