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<?php
  $category = get_the_category();
	for ($i = 0; $i <= count($category); ++$i) {
	echo $category[$i]->cat_name;
}?>


//カテゴリー名を表示
<?php echo $category[0]->cat_name;?>
 
//スラッグを表示
<?php echo $category[0]->cat_nicename;?>
 
//カテゴリーIDを表示
<?php echo $category[0]->cat_ID;?>


<?php echo $category[0]->cat_name;?>
<?php echo $category[1]->cat_name;?>
<?php echo $category[2]->cat_name;?>