drupal programmatically disable or remove node create node link(s) - drupal

Question

In the context of organic groups, I am writing a module which will stop users who are not members of a group from adding group posts into that group.
My module currently sets the permissions necessary and detects whether a user has the permission.
So when a user(s) are looking at a group page, I want to disable/remove the standard link to create group posts.

Answer 1

Try this method.
function mymodule_menu_alter(&$items) {
global $user;
// Perform code for finding out users permissions.
// lets suppose we set true or false to $restricted after all
if ($restricted && isset($items['node/add/yourtype'])) {
$items['node/add/yourtype']['access arguments'] = FALSE;
// or unset($items['node/add/yourtype']) to remove item for user
}
}

Answer 2

If I understood right you don't want certain users to create a content type.
So the steps are:
1) Create a menu hook.
// Here we make sure if the user goes to for creating this node type
// we can use the appropriate call back function to stop it.
function yourmodoule_menu() {
$items = array();
$items['node/add/page'] = array(
'page arguments' => array('yourmodule_additional_actions'),
'access arguments' => array('administer create content')
);
}
2) Then make a permission hook to make sure only certain users have this permission.
// drupal will only allow access to to path 'node/add/page' with people
// who have access given by you.
function yourmodule_permission() {
return array(
'add content' => array(
'title' => t('Administer create conent'),
'description' => t('Perform administration tasks and create content')
)
)
}
3) Write your code for those users who have the permission.
// Only affter they have this permisson drupal will allow them access
// to the below function.
function yourmodule_additional_actions() {
// this code will only execute if the user has the permission
// "Administer create conent"
}