Get the Category Id and Title in wordpress

Display the category name:

<?php
$category = get_the_category(); 
echo $category[0]->cat_name;
?>

But, If multiple categories, it will show only the first category name.

single_cat_title(), it's working only in category.php for me.

<?php $current_category = single_cat_title("", false); ?>

false is used when we need to assign value in PHP variable,

<?php $current_category = single_cat_title("", true); ?>

true is used when we need to display category without echo, the first parameter is for prefix for the category, the first parameter is only working for a true option for me.

Get the category Id:

<?php echo $cur_cat_id = get_cat_id( single_cat_title("",false)); ?>