Run the code between specified hours in php-CodePudding

I want to run my code from 21:00 to 08:00, for example. But my code does not work properly because when the clock reaches 24:00 (00:00), my code gets confused and cannot set 01:00. check 00:00 because it is a 24-hour clock.

I need this code for the dark mode of the site, so that my site will be in dark mode between a desired hour, for example, from 10 pm to 6 am.

Note: I may specify any hour for this task and I do not choose just one hour. For example, I may choose 21:00 to 3:00 am. It is random because the hours are chosen by my clients and I do not know what hours they choose. !!!

Can you guide me to make my code work correctly in 24 hours if I specify any hour?


    $hour = date('H');
    //$hour = 23;

    if( $hour > 22 && $hour < 8) {

      echo "Good night";

    }else{
      echo "Good Morning";
    }

CodePudding user response：

You can use the modulo operator to handle the 24-hour clock.

$start_hour = 21;
$end_hour = 8;
$current_hour = date('H');

// handle the 24-hour cycle
$current_hour = $current_hour % 24;

if($current_hour >= $start_hour || $current_hour < $end_hour) {
    echo "Good night";
} else {
    echo "Good morning";
}

This way it will work for any hours range you choose, as long as the start hour is greater than or equal to the end hour.

CodePudding user response：

You need opposite logic for 21:00 to 08:00 and 08:00 to 21:00. It's easier to see if you create a dedicated function:

function inRange(int $start, int $end, int $current = null): bool
{
    if ($current === null) {
        $current = date('H');
    }
    if ($start < $end) {
        return $current >= $start && $current <= $end;
    }
    return $current >= $start || $current <= $end;
}

Please note this is just an oversimplified example that's ignoring minutes and seconds. To make it more accurate, you can:

Pass full H:M:S / H:M strings
Convert everything to seconds (3600 * $h 60 * $m $s).

CodePudding user response：


    $wake_up = 8;
    $sleep = 23;
    if ($hour < $wake_up) {
        echo "Good night";
    } else if ($hour > $sleep) {
        echo "Good night";
    } else {
        echo "Good Morning";
    }