//查詢php頁面載入時間和執行
$start = microtime(true);
//code 
$finish = microtime(true);
printf(" total run: %.2f s <br> memory usage: %.2f M <br> ", round(($finish - $start), 4),memory_get_usage() / 1024 / 1024 );

//時間戳比較兼計算
if(strtotime('+7day','1528106187') >= time()){
    echo date('Y-m-d H:i:s',strtotime
 
("+7day","1528106187"));
    echo "超過7天";
}else{
    echo date('Y-m-d H:i:s',strtotime("+7day","1528106187"));
}

待續。。。