<?php // 64160267 kanokpol promtha // DiagonalDifference function exam02($arry){ $arrDiag = count($arry); //ซ้าย $firstD = 0; // ขวา $secondD = 0; $i = 0; for($j = 0; $j < $arrDiag; $j++){ $firstD += $arry[$i++][$j]; $secondD += $arry[$arrDiag - $i][$j]; } // ซ่าย - ขวา return abs($firstD - $secondD); } function test_01(){ if(exam02([[1,2],[3,4]]) == 0){ echo "pass"; } else { echo "fail"; } if(exam02([[1,2,4], [4,5,9], [7,8,9]]) == 1){ echo "pass"; } else { echo "fail"; } } test_01();