I have a 2D array like
attendee_programs = [1 =>[100,101],
2 =>[100,101,102]
];
I want to get array_values() and array_unique() but only for the nested elements (sorry, not sure what the terminology is) ...I.E.
programs = [100,101,102];
Is there a php function for this? or do I need to loop through and assemble it manually?
Edit: All of the answers are very helpful and have shown me something new. Sorry I can only accept one.
You could use a clever combination of array_unique, array_reduce and array_merge to achieve this:
$a = array_unique(array_reduce($attendee_programs, 'array_merge', []));
Doing this might be end in an array with some gaps in the indizes - if you need gaples array keys, you have to add array_values at the end
$a = array_values($a);
array_values() to reindex the arrayYou can use:
call_user_func_array('array_merge', array_values($attendee_programs));
to get values of nested array.
array_unique(call_user_func_array('array_merge', array_values($attendee_programs)));
to get unique values.
Solution:
function flatten($array)
{
$rit = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
return iterator_to_array($rit, true);
}
echo '<pre>';
print_r(flatten($attendee_programs));
Result:
Array
(
[0] => 100
[1] => 101
[2] => 102
)
Yet another option:
$flat = array();
array_walk_recursive($attendee_programs, function($value) use (&$flat) {
$flat[] = $value;
});
$flat = array_unique($flat);
