php - Selectbox Parent indent -


i have simlpe selectbox. it's printing out fine, want indent subcats layout looks like:

hardware  - cpu  - motherboards   -- msi   -- asus screens  - dell   -- 27" acer

in db table defined as:

id - label - parent

my current code is:

<select label="users" id="cat" onchange="showuser(this.value)" style="width:100%;padding:3px;cursor:pointer;"> <option value="">-- choose category -- </option> <?php  $categories = $mysqli->query("select * medialib_cats"); while($row = $categories->fetch_assoc()){?>     <option value="<?php echo $row['id']; ?>">     <?php echo $row['label']; ?>     </option>  <?php } ?> </select>

i have tried grouping results group by, did not work. how make automaticly indenting php/mysqli? guess should use recursion? indent lines -- , not using optgroup please :)

an option using optgroups:

<select label="users" id="cat" onchange="showuser(this.value)" style="width:100%;padding:3px;cursor:pointer;"> <option value="">-- choose category -- </option> <?php  $categories = $mysqli->query("select * medialib_cats"); while($row = $categories->fetch_assoc()){     if ($lastgrp != $row['parent']) {         if ($lastgrp!="") echo "</optgroup>";         $lastgrp = $row['parent'];         echo "<optgroup>".$lastgrp;     }     echo "<option value="+ $row['id'] + ">"+  $row['label'] + "</option>";  } ?></optgroup> </select>

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