$obls[0]="Опель";$obls[1]="Мазда";
$obls[2]="НеОпель";$obls[3]="Немазда";
<select style="width:182px;" class="select1" name=al><option value="">?</option>'; for ($i=0;$i<=3;$i++) echo '<option value="'????'">'.$obls[$i].'</option></select>'
<?php
$obls = ['opel', 'mazda', 'val3', 'val4']; // available since php 5.4
?>
<select class="selector">
<option value="">Choose an item...</option>
<?php foreach ($obls as $key => $val) : ?>
<option value="<?php echo $key; ?>"><?php echo $val; ?></option>
<?php endforeach; ?>
</select>