- array_filter: documentation ( source)
- max: documentation ( source)
<?php
$levels = [0, 24999, 49999, 74999, 9999, 124999];
$myallcreadits = 60000;
$result = max(array_filter($levels, function($x) use ($myallcreadits)
{
return $x<$myallcreadits;
}));
$details='<div id="$result">'.$result.'</div>';
echo $details;