• How-To Create/Edit Local Config Files (.local.php)

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First read ((Doc/Dev/Configuration|Configuration Files))

Applying changes to the files in {{config/}} (does not apply to {{conf.php}} as this is managed though the web-interface and updated automatically) directories is not recommended as when you update Horde modules these files will be replaced.
Horde has supplied us a method to get around this problem with local overrides which are not overwritten each time the modules are updated. There are also other methods such as {{vhosts}} or {{prefs.d/}} which this article does not go into directly but the principle is the same.

There are a few ways to add entries into the local files.

• Replace full array
  
$mime_drivers = array(
/* HTML driver settings /
'html' => array(
/ NOTE: Inline HTML display is turned OFF by default. */
'inline' => false,
'handles' => array(
'text/html'
),
'icons' => array(
'default' => 'html.png'
),

    /* If you want to limit the display of message data inline for large
     * messages, set the maximum size of the displayed message here (in
     * bytes).  If exceeded, the user will only be able to download the
     * part. Set to 0 to disable this check. */
    'limit_inline_size' => 1048576,
  
    /* Check for phishing exploits? */
    'phishing_check' => true
  

  )
);


• Replace individual array entry
  
/* HTML driver settings /
$mime_drivers['html'] = array(
/ NOTE: Inline HTML display is turned OFF by default. */
'inline' => false,
'handles' => array(
'text/html'
),
'icons' => array(
'default' => 'html.png'
),

    /* If you want to limit the display of message data inline for large
     * messages, set the maximum size of the displayed message here (in
     * bytes).  If exceeded, the user will only be able to download the
     * part. Set to 0 to disable this check. */
    'limit_inline_size' => 1048576,
  
    /* Check for phishing exploits? */
    'phishing_check' => true
  

  );

• Modify individual entries within the array
  
$mime_drivers['html']['inline']=true;


• Merge array to existing array (useful in the case of the format seen in mime_drivers.php)
  
$mime_drivers=array_merge($mime_drivers,array(
/* Plain text viewer. */
'plain' => array(
'inline' => true,
'handles' => array(
'application/pgp',
'text/plain',
'text/rfc822-headers'
),

    /* If you want to limit the display of message data inline for large
     * messages, set the maximum size of the displayed message here (in
     * bytes).  If exceeded, the user will only be able to download the
     * part. Set to 0 to disable this check. */
    'limit_inline_size' => 1048576,
  
    /* If you want to scan ALL incoming text/plain messages for UUencoded
     * data, set the following to true. This is very performance intensive
     * and can take a long time for large messages. It is not recommended
     * (as UUencoded data is rare these days) and is disabled by
     * default. */
    'uudecode' => false
  

  ),

  /* HTML driver settings /
  'html' => array(
  / NOTE: Inline HTML display is turned OFF by default. */
  'inline' => false,
  'handles' => array(
  'text/html'
  ),
  'icons' => array(
  'default' => 'html.png'
  ),

    /* If you want to limit the display of message data inline for large
     * messages, set the maximum size of the displayed message here (in
     * bytes).  If exceeded, the user will only be able to download the
     * part. Set to 0 to disable this check. */
    'limit_inline_size' => 1048576,
  
    /* Check for phishing exploits? */
    'phishing_check' => true
  

  )
));