mysql_fetch_assoc() expects parameter 1 to be resource, array given

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PHP

How to read array by row,,?i have tried everything..

Array:
Array ( [0] => Array ( [category_id] => 2 [title] => Deck Courses [course_title] => Adaptive Steering ) [1] => Array ( [category_id] => 2 [title] => Deck Courses [course_title] => Test subject 2 ) [2] => Array ( [category_id] => 2 [title] => Deck Courses [course_title] => Test subject 4 ) [3] => Array ( [category_id] => 3 [title] => Engine Room Courses [course_title] => Test subject 3 ) )


Error: mysql_fetch_assoc() expects parameter 1 to be resource, array given

<?php

        //print_r($categories);exit;
        $current_cat = null;

        //while ($row = $categories->fetch())
        //while ($row = mysqli_fetch_row($categories))
        //while($row = mysql_fetch_array($categories))
        //while($row = mysql_fetch_row($categories))
        while($row = mysql_fetch_assoc($categories))
        {
        //print_r($row);exit;
        if ($row["title"] != $current_cat)
        {
        $current_cat = $row["title"];
          echo $current_cat; // course category name
          echo $row["course_title"]; // course name
        }
        else
        {
          echo $row["course_title"]; // course name 
        }
        } ?>