co powinienem zmienic zeby skrypt nie sprawdzal 5 razy tego warunku? z gory dziekuje za podpowiedz

if($pelna_data==$tablica[$zmienna])

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$res_date_start = '2020-10-10';
$res_date_end = '2020-10-15';
 
$liczba_dni = ((strtotime($res_date_end))-(strtotime($res_date_start)) )/ (60*60*24);
 
$tablica = array();
 
for ($number_day = 0; $number_day <= $liczba_dni; $number_day++) {
 
    $data_do_sprawdzenia = date('Y-m-d', strtotime( $res_date_start . " +$number_day day"));
 
    $tablica[] = $data_do_sprawdzenia;
}
 
print_r($tablica);
 
function days_in_month($month, $year)
{
    return $month == 2 ? ($year % 4 ? 28 : ($year % 100 ? 29 : ($year % 400 ? 28 : 29))) : (($month - 1) % 7 % 2 ? 30 : 31);
}
 
echo '<table>';
echo '<tr><td></td>';
for ($number = 1; $number <= 31; $number++) {
    echo '<td>'.$number.'</td>';
}
echo '</tr>';
 
for ($number = 1; $number <= 12; $number++) {
    echo '<tr><td>'.$number.'</td>';
    for ($day = 1; $day <= days_in_month($number,2020); $day++) {
 
        $pelna_data = '2020-'.$number.'-'.$day;
        $zmienna = '0';
        while($zmienna < $liczba_dni+1) // warunek kontynuacji pętli
        {
            if( isset($tablica[$zmienna]) ){
                if($pelna_data==$tablica[$zmienna]){
                    echo '<td style="background: #ff6600;">'.$day.'</td>';
                }else{
                    echo '<td style="background: #ccc;">'.$day.'</td>';
                }
            }    
            $zmienna++;    
        } 
    }
    echo '</tr>';
}
echo '</table>';
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function date_range($first, $last, $step = '+1 day', $output_format = 'd/m/Y' ) {
 
    $dates = array();
    $current = strtotime($first);
    $last = strtotime($last);
 
    while( $current <= $last ) {
 
        $dates[] = date($output_format, $current);
        $current = strtotime($step, $current);
    }
 
    return $dates;
}
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