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Hello there, to this Article I am considering that you have already setup your Drupal Services, Json Server and already have a beautiful Cake PHP running...
So, let's code:

1 - Created a Module:
- Folder: wilsolutions_service
- Files: wilsolutions_service.info and wilsolutions_service.module

1.1 - Info file wilsolutions_service.info:

;$Id$
name = "Wilsolutions Service"
description = "Provides services to interact with Users Object."
core = 6.x
dependencies[] = services

1.2 - Module file wilsolutions_service.module:
Note: Basically consuming this Web Service will have access to the method: wilsolutions_user.get, It return an User Object using an e-mail as argument.

<?php
/**
* Implementation of hook_help().
*/
function wilsolutions_service_help($section) {
  switch ($section) {
    case 'admin/help#services_node':
      return t('<p>Provides echo methods to services applications. Requires services.module.</p>');
    case 'admin/modules#description':
      return t('Provides echo methods to services applications. Requires services.module.');
  }
}

function wilsolutions_service_perm() {
  return array(
    'get any user data', 'get own user data',
    'update any user data', 'update own user data',
    'create new users',
    'delete any user', 'delete own user',
  );
}


/**
 * Check if the user is allowed to get the user data.
 *
 * @param $uid
 *   Number. The user ID.
 */
function wilsolutions_user_service_get_access($uid) {
  global $user;
  return (($user->uid == $uid && user_access('get own user data')) || ($user->uid != $uid && user_access('get any user data')));
}

/**
* Implementation of hook_service()
*/
function wilsolutions_service_service() {
  return array(        
    array(
      '#method'        => 'wilsolutions_user.get',
      '#callback'    => 'wilsolutions_user_service_get',
      '#access callback'  => 'wilsolutions_user_service_get_access',    
      '#args'       => array(
        array(
          '#name'    => 'mail',
          '#type'   => 'string',
          '#description' => t('Array(mail).'),
        ),
      ),
      '#return' => 'struct',
      '#help'   => t('Get all user details.')
    ),
  );
}

function wilsolutions_user_service_get($mail) {
  $account = user_load(array('mail'=>$mail));
  if (empty($account)) {
    return services_error(t('There is no user with such e-mail.'), 404);
  }
  // Everything went right.
  return $account;
}



function wilsolutions_service_echo($message) { 
  $return = new stdClass();
  $return->sessid = session_id();
  $return->message = $message;
  return $return;
}
?>

Wilsolutions

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Drupal Web Services + Json Server + Cake PHP - Part 2

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