Sample of subtract minutes to hours on PHP

subminutes.php

<?php

function subMins($ihour, $imin, $iminutes)
{
    $hours=floor($iminutes/60);
    $mins=$iminutes%60;
    
    echo("Se restan $hours h + $mins m\n");
    
    $rhours=$ihour-$hours;
    $rmins=$imin-$mins;
    
    if($rmins<0)
    {
        $rmins=60+$rmins;
        $rhours=$rhours-1;
    }
    
    if($rhours<0)
    {
        $rhours=24+$rhours;
    }

    echo("Res: $ihour:$imin - $iminutes m = $rhours:$rmins\n");
}

$hour=0;$min=59;
subMins($hour,$min,1);
subMins($hour,$min,10);
subMins($hour,$min,50);
subMins($hour,$min,59);
subMins($hour,$min,60);
subMins($hour,$min,61);
subMins($hour,$min,120);
subMins($hour,$min,181);
subMins($hour,$min,242);