function node_validate

Implements hook_validate().

Performs validation checks on the given node.

File

modules/node/node.module, line 1011

Code

function node_validate($node, $form, &$form_state) {
    if (isset($node->nid) && node_last_changed($node->nid) > $node->changed) {
        form_set_error('changed', t('The content on this page has either been modified by another user, or you have already submitted modifications using this form. As a result, your changes cannot be saved.'));
    }
    // Validate the "authored by" field.
    if (!empty($node->name) && !($account = user_load_by_name($node->name))) {
        // The use of empty() is mandatory in the context of usernames
        // as the empty string denotes the anonymous user. In case we
        // are dealing with an anonymous user we set the user ID to 0.
        form_set_error('name', t('The username %name does not exist.', array(
            '%name' => $node->name,
        )));
    }
    // Validate the "authored on" field.
    if (!empty($node->date) && strtotime($node->date) === FALSE) {
        form_set_error('date', t('You have to specify a valid date.'));
    }
    // Invoke hook_validate() for node type specific validation and
    // hook_node_validate() for miscellaneous validation needed by modules. Can't
    // use node_invoke() or module_invoke_all(), because $form_state must be
    // receivable by reference.
    $function = node_type_get_base($node) . '_validate';
    if (function_exists($function)) {
        $function($node, $form, $form_state);
    }
    foreach (module_implements('node_validate') as $module) {
        $function = $module . '_node_validate';
        $function($node, $form, $form_state);
    }
}