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PHP Converting Decimal Time To H:M:S

So I'm passing a variable from Javascript into PHP that marks the Current Time on a video being played. And I have no problem passing that decimal into mySQL, but I don't want it in decimal form. The Javascript .currentTime function seems to output a float or a double in seconds. And when I try to pass that into my VARCHAR in mySQL I get an empty spot, not null, just blank. It works if I remove this code and just switch $currentTimeRaw for $currentTime. That effectively bypasses this piece of code. So I know the problem is here but I can't figure out what I did wrong.

$currentTimeRAW = $_GET['currentTime'];
        $minutes = 0;
        $hours = 0;
        while($currentTimeRAW >= 3600){
            $currentTimeRAW = $currentTimeRAW - 3600;
            $hours++;
        }
        while($currentTimeRAW >= 60){
            $currentTimeRAW = $currentTimeRAW - 60;
            $minutes++;
        }
        if($hours>0){
            $currentTime = $hours.':'.$minutes.':'.$currentTimeRAW;
        } else if ($hours=0){
            $currentTime = $minutes.':'.$currentTimeRAW;
        } else if ($hours=0 && $minutes=0){
            $currentTime = $currentTimeRAW;
        }


source https://stackoverflow.com/questions/68595751/php-converting-decimal-time-to-hms

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