How do I write a function to determine if the user is either the node author or admin?
if ( logged user is author || admin ) {
// …
}
It is for the node template.
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Which template file do you want to alter?– marcvangendCommented Mar 6, 2012 at 9:20
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Based on the title, this question could be one of three things. "How does boolean logic work (in PHP)?", "How do I determine if the user is also the author?", "How do I determine if the user is an admin?". Reading the question removes the first option. Downvoted for two questions in one, and a title that doesn't reflect the question well.– LetharionCommented Mar 6, 2012 at 9:53
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3 Answers
Put this to template.php file of your theme:
function YOUR_THEME_NAME_preprocess_node(&$variables) {
global $user;
if(in_array('administrator', $user->roles) || $variables['node']->uid == $user->uid) {
$variables['is_admin_or_author'] = TRUE;
}
else {
$variables['is_admin_or_author'] = FALSE;
}
}
then in your node.tpl.php or node--your-content-type.tpl.php you'll have a variable $is_admin_or_author with either TRUE or FALSE value.
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This is a good answer, assuming that the question was about the node template. Commented Mar 6, 2012 at 9:51
Instead of checking if the user is the author or admin, it is recommended to check for permissions to perform a certain action. That will make your system more flexible and you're fully taking advantage of the permission system already built into Drupal.
For instance, if you want to show/hide something depending on the permission to edit the current node, you can use this (assuming you're working with node.tpl.php):
function YOUR_THEME_NAME_preprocess_node(&$variables) {
if (node_access('update', $variables['node'])) {
$variables['permission_to_edit'] = TRUE;
}
else {
$variables['permission_to_edit'] = FALSE;
}
}
Now you can use the following in your node.tpl.php:
if ($permission_to_edit) {
print "You may edit this node!";
}
answered Mar 6, 2012 at 10:01
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thanks marc, its useful idea, but its for flag module, to show something even when they aren't allowed to bookmark, so this won't work– devricCommented Mar 6, 2012 at 13:14
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1Of course this is just an example, there may be other permissions you can check with user_access that are more appropriate for your situation. Flag module itself also has functions to check certain permissions (see api.lullabot.com/file/contrib/flag/flag.module/7). Anyway, the most important message is this: I would always prefer checking permissions over checking user IDs or roles. Commented Mar 6, 2012 at 14:07
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This is the Drupal way: You never check if the user has a specific role, but if the user has a specific permission. The reason is maintainability of the code: Suppose you add more roles, you don't need to rewrite all the
if-statements because the code would always beif (user_access('get hamburgers')) { }.– avpaderno ♦Commented Mar 6, 2012 at 14:34 -
well i checked off the ability to flag if their are either author/admin/anonymous, which create flag link will return null. i thought it would be easier this way, to check if they are logged/admin/author than show something else– devricCommented Mar 8, 2012 at 1:08
global $user;
if ($node->uid == $user->uid || $user->uid == 1) {
return TRUE;
}
else {
return FALSE;
}
You can also check for user roles by adding in_array('administrator', array_values($user->roles)) to the if statement if you had a seperate role (webmaster for example).
