Get current category ID of the active page

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How To Get current category ID of the active page

<?php  
	categories = get_the_category();
	category_id = $categories[0]->cat_ID;
	query_posts("cat=$category_id & post_per_page= -1 ");
	if(have_posts()):  while(have_posts()): the_post();?>



<li id="menu-item-137" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-137"><a href="<?php the_permalink();?>"> <?php the_title();?></a></li>

<?php endwhile; endif;?>

Published by Zahid Hossain