php - Fetch subcategory in fetched category -


what trying build next. fetch menu categories , display them, fetch subcategories each category special display also. hope understand want , saying. got lost in code , don't how this. here code, hope can me.

here table structure.

subcategory table

| id | subcategory_name | id_category |

category table

| id | category |

id_category connected id in category table

<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">       <ul class="nav navbar-nav navbar-left">         <?php           $pdo = connect();                        $sql = "select * category";           $query = $pdo->prepare($sql);           $query->execute();           $row = $query->fetchall();                  foreach ($row $rs) { ?>              <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false"><?php echo $rs['category'] ?><span class="caret"></span></a>               <ul class="dropdown-menu" role="menu">                 <?php                 $sql = "select subcategory.subcategory_name, subcategory.id_category, category.id, category.category                         subcategory                         inner join category                         subcategory.id_category = category.category";                 $query = $pdo->prepare($sql);                 $query->execute();                 $subcat = $query->fetchall();                        foreach ($subcat $sub) { ?>                  <li><a href="#"><?php echo $sub['subcategory_name'] ?></a></li>                  <?php } ?>                </ul>               </li>            <?php } ?>       </ul>       <ul class="nav navbar-nav navbar-right">         <li><a href="includes/logout.php">logout</a></li>       </ul>       </div><!-- /.navbar-collapse -->     </div>

i think didn't understand inner join sql select statement. have declare relation of second table first one:

select column_list t1 inner join t2 on join_condition1 where_conditions;

join condition in want put "subcategory.id_category = category.category" part of query. maybe leave out actual clause? hope helps. here

edit: proposing pointed rewrite complete code in 1 query. code simplified using captured variable first sql query:

<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">       <ul class="nav navbar-nav navbar-left">         <?php           $pdo = connect();                        $sql = "select * category";           $query = $pdo->prepare($sql);           $query->execute();           $row = $query->fetchall(pdo::fetch_assoc);                  foreach ($row $rs) { ?>              <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false"><?php echo $rs['category'] ?><span class="caret"></span></a>               <ul class="dropdown-menu" role="menu">                 <?php                 $sql = "select subcategory_name, id_category                         subcategory                         id_category = '".$rs['id']."'";                 $query = $pdo->prepare($sql);                 $query->execute();                 $subcat = $query->fetchall(pdo::fetch_assoc);                        foreach ($subcat $sub) { ?>                  <li><a href="#"><?php echo $sub['subcategory_name'] ?></a></li>                  <?php } ?>                </ul>               </li>            <?php } ?>       </ul>       <ul class="nav navbar-nav navbar-right">         <li><a href="includes/logout.php">logout</a></li>       </ul>       </div><!-- /.navbar-collapse -->     </div>

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