Comparing arrays

Hi guys,

I'm curious if there is a built-in method to get an array which is a
result of comparing two other arrays with the same structure?

Like

$a = array('k1' => 'v1', 'k2' => 'v2', 'k3' => '')
$b = array('k1' => '', 'k2' => 'v2', 'k3' => 'yo momma')

comparison of the two would give

$c = array('k1' => '', 'k3' => 'yo momma')

If not, I'll try to write this up, but maybe there is a ready method for
this.

Regards,
Jacek

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