如何检查多维数组是否只包含空值？

Question

I looked around and can't quite find the answer for this, so I'm wondering if I contain an array such as this..

$array['foo']['bar'][1] = '';
$array['foo']['bar'][2] = '';
$array['foo']['bar'][3] = '';
$array['foo']['bar'][4] = '';

How can I check if all the values are empty? I tried doing the following:

if (empty($array['foo']['bar'])) {
    // Array empty
}

But as expected that didn't work.

How can I do this?

Answer 1

If you wanted to check to see if all of the values where populated you can use

 if(call_user_func_array("isset", $array['foo']['bar']))

For what you want to do though you could use array reduce with a closure

 if(array_reduce($array, function(&$res, $a){if ($a) $res = true;}))

Note this will only work in php 5.3+