get all unique values from a page-field in all pages …

[ngrmm]

$p are all the pages
all $p have a page-reference-field $cat

first i exclude all the pages in $p which has no value for $category (multi-field)

		$p = $pages->find("template='xy', category!=''");

now i want to get an array of all values stored in the $category-Field of these pages.
 

[ngrmm]

this works

		$uniques = new \ProcessWire\PageArray();
		foreach($p as $item) {
		    $uniques->import($item->category);
		}

 

[psy]

Nice

 

[Robin S]

21 minutes ago, psy said:

Instead of looping through a foreach, it may be quicker to use:

$p = $pages->find("template='xy', category!=''");
$uniques = $p->unique();

// or even less code with:
$p = $pages->find("template='xy', category!=''")->unique();

 

This isn't quite the same thing. What @ngrmm wants is unique categories (stored within a Page Reference field on each 'xy' page).

Also, it is never necessary to do $pages->find($selector)->unique() because a PageArray is automatically unique. 

[psy]

Thanks @Robin S. too early in the morning. Realised I'd misread the requirement and edited my post.