php - how can I do some code before I build the form in Drupal 7 (kinda preprocess)? -

i'd ask how can code before build form in drupal 7? before defining form i'd perform code(i want build object), how can it?

the code want perform:

if (isset($_get["team"])){$team = $_get["team"];} else {$team=1; }; $myteam = new team($team); 

i define form:

function teamform_nameform() {      $form['editteam']['team_city'] = array(      '#title' => t('team city'),      '#type' => 'textfield',      '#description' => t(''),          '#required' => true,         '#default_value' =>**$myteam->returncity()**,         '#size' => 30,       ); $form['editteam']['submitcontentchanges'] = array(       '#type' => 'submit',       '#value' => t('save changes'),      '#submit' => array('teamform_editteam_submitcontentchanges'), ); } 

i tried use following hook, doesn't work. (i still can't access variable $team , object $myteam (it's written undefined))

/**   *  implements hook_form_alter().   */      function teamform_form_alter(&$form, &$form_state, $form_id) {       global $team;      if (isset($_get["team"])){$team = $_get["team"];} else {$team=2;};      global $myteam      $myteam = new team($team);    } 

$team team id using method or if it's not set assign default value. $myteam object build based on team_id. i'd access object in function teamform_nameform(). in function use method returncity() in order return city team belongs to; default value. i'd make changes object. specifically, when user changes city of team , click submit button want update city in object $myteam. therefore use function:

function teamform_editteam_submitcontentchanges($form, &$form_state){   $team_city=$form_state['values']['team_city'];   $myteam->updateteamcity($team_city); //i got error here. it's said $myteam undefined! } 

it looks want object persist across page loads, sound right? if that's case, can store in session. try this:

/**   *  implements hook_form_alter().   */  function teamform_form_alter(&$form, &$form_state, $form_id) {    $team = isset($_get["team"]) ? $_get["team"] : 2;   $_session['team'] = new team($team); } 

function teamform_editteam_submitcontentchanges($form, &$form_state){   $team_city = $form_state['values']['team_city'];    $myteam = $_session['team'];   $myteam->updateteamcity($team_city); }