3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php // user input of years $ar = [1944, 1674, 3021]; // find max year $maxCentury = max(...$ar); // get max century $roundedCentury = round($maxCentury, -3); foreach($ar as $year) { foreach(range(0, $roundedCentury, 1000) as $century) { if($century <= $year) { echo "<li> $century <ul>" . $year . "</ul> </li>"; } } }
based on BiPuX
Output for 5.6.0 - 7.3.0alpha1
<li> 0 <ul>1944</ul> </li><li> 1000 <ul>1944</ul> </li><li> 0 <ul>1674</ul> </li><li> 1000 <ul>1674</ul> </li><li> 0 <ul>3021</ul> </li><li> 1000 <ul>3021</ul> </li><li> 2000 <ul>3021</ul> </li><li> 3000 <ul>3021</ul> </li>