隨機當天指定固定日期方法

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function fakeDay( $nowDay = null ){
    if(!isset($nowDay)){
        $nowDay = date('Y-m-d');
    }
    $today = $nowDay;
    $firstday = '2018-01-01'; //寫入有資料的區間
    $lastday  = '2018-12-31';  //寫入有資料的區間
    $firstday_unixday = strtotime( $firstday ) / (60*60*24);
    $lastday_unixday  = strtotime( $lastday ) / (60*60*24);

    $range =  ($lastday_unixday - $firstday_unixday + 1 ) > 0 ? ($lastday_unixday - $firstday_unixday + 1 ) : 1;

    $add_date = (strtotime($today)/(60*60*24)) % $range;

    $fake_today = date('Y-m-d', strtotime("$firstday + $add_date day"));
    echo $fake_today;
}



echo fakeDay() . "\n";
echo fakeDay(date('Y-m-d',strtotime('now + 1 day'))) . "\n";