get_the_category()
works in THE LOOP. Using this you will get array of category object for each post the loop is currently processing. example :
//the loop
$categories = get_the_category();
//the loop cont....
var_dump($categories);
array
0 =>
object(stdClass)[191]
public 'term_id' => &string '1' (length=1)
public 'name' => &string 'Uncategorized' (length=13)
public 'slug' => &string 'uncategorized' (length=13)
public 'term_group' => string '0' (length=1)
public 'term_taxonomy_id' => string '1' (length=1)
public 'taxonomy' => string 'category' (length=8)
public 'description' => &string '' (length=0)
public 'parent' => &string '0' (length=1)
public 'count' => &string '1' (length=1)
public 'object_id' => string '66' (length=2)
public 'cat_ID' => &string '1' (length=1)
public 'category_count' => &string '1' (length=1)
public 'category_description' => &string '' (length=0)
public 'cat_name' => &string 'Uncategorized' (length=13)
public 'category_nicename' => &string 'uncategorized' (length=13)
public 'category_parent' => &string '0' (length=1)
1 =>
object(stdClass)[190]
public 'term_id' => &string '3' (length=1)
public 'name' => &string 'asd' (length=3)
public 'slug' => &string 'asd' (length=3)
public 'term_group' => string '0' (length=1)
public 'term_taxonomy_id' => string '3' (length=1)
public 'taxonomy' => string 'category' (length=8)
public 'description' => &string '' (length=0)
public 'parent' => &string '0' (length=1)
public 'count' => &string '1' (length=1)
public 'object_id' => string '66' (length=2)
public 'cat_ID' => &string '3' (length=1)
public 'category_count' => &string '1' (length=1)
public 'category_description' => &string '' (length=0)
public 'cat_name' => &string 'asd' (length=3)
public 'category_nicename' => &string 'asd' (length=3)
public 'category_parent' => &string '0' (length=1)
now you can iterate through each category, like so
foreach($categories as $category){
echo $category->name; //category name
$cat_link = get_category_link($category->cat_ID);
echo '<a href="'.$cat_link.'">'.$category->name.'</a>'; // category link
}