Online PHP editor | refs for DPJiL

<?php class NameObj { public $name; function __construct($name){ $this->name = $name; } } class IdObj{ public $id; function __construct($id){ $this->id = $id; } } $idArray = array( new IdObj(1), new IdObj(2), new IdObj(3) ); $nameArray = array( new NameObj('1 - Object 1 Name'), new NameObj('2 - Object 2 Name') ); function custom_diff($oId, $oName){ $temp = $oId; $oId = $oId instanceof IdObj?$oId:$oName; $oName = $oName instanceof NameObj?$oName:$temp; $splitName = explode(' - ', $oName->name); $idFromName = $splitName[0]; $id = $oId->id; if($idFromName == $id) return 0; return $idFromName > $id ? 1 : -1; } $missing_objects = array_udiff($idArray, $nameArray, 'custom_diff'); print_r($missing_objects);