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<?php // Arrays to compare $array1 = array(new stdclass, new stdclass, new stdclass, new stdclass, ); $array2 = array( new stdclass, new stdclass, ); // Set some properties for each object $array1[0]->width = 11; $array1[0]->height = 3; $array1[1]->width = 7; $array1[1]->height = 1; $array1[2]->width = 2; $array1[2]->height = 9; $array1[3]->width = 5; $array1[3]->height = 7; $array2[0]->width = 7; $array2[0]->height = 5; $array2[1]->width = 9; $array2[1]->height = 2; function compare_by_area($a, $b) { $areaA = $a->width * $a->height; $areaB = $b->width * $b->height; if ($areaA < $areaB) { return -1; } elseif ($areaA > $areaB) { return 1; } else { return 0; } } print_r(array_udiff($array1, $array2, 'compare_by_area')); ?>