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<?php $arr = array( "mac_address"=>"989096e255a1", "status" =>"Known", "attributes" => array( "Owner"=>"rogue@wpi.edu", "IPAM-Hostname"=>"dresden.wpi.edu", "IPAM-AdminState"=>"OK", "IPAM-NAS-IP-Address"=>"", "IPAM-NAS-Port-ID"=>"", "IPAM-RADIUS-VLAN"=>"", "IPAM-TimeStamp"=>"2017-07-11 11:18:33 EDT", "Guest Role ID"=>"", "MAC-Auth Expiry"=>"", "Username"=>"" ), "Username"=>"" ); $filtered = array_filter($arr, function($var) {if(is_array($var))?return array_map('array_filter', $var):return !empty($var);} ); print_r($filtered);
based on QVE4Q

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for Arrow functions
Parse error: syntax error, unexpected '?' in /in/PgNLL on line 22

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