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List all machine name values for permissions in drupal 7


By Marko Blažeković - Posted on 24 February 2016

// Render permission overview:
$options = array();
foreach (module_list(FALSE, FALSE, TRUE) as $module) {
if ($permissions = module_invoke($module, 'permission')) {
// List only the modules that have permissions.
dsm($module);
dsm($permissions);
}
}

you can also use Devel module and Enable "Display machine names of permissions and modules" option and will have it on hover at permission page.