How to get category name using post id in WordPress?

We can use inbuilt WordPress function get_the_category() to do that.

get_the_category() used to retrieve post category or categories.

Syntax

get_the_category( int $post_id = false )

where $post_id is optional. The defaults value is false but it defaults to current post ID.

It returns an array of objects, one for each category assigned to the post.

👉 This function only returns results from the default “category” taxonomy and not from custom taxonomies. To get results of custom taxonomies we can use get_the_terms().

Example

$categories = get_the_category('1');//$post->ID

foreach($categories as $category){
  echo $category->name;
}

More get_the_category() Examples

Show the First Category Name Only

$categories = get_the_category();
 
if ( ! empty( $categories ) ) {
    echo esc_html( $categories[0]->name );   
}

Dump all the categories related to a post

$categories = get_the_category('1');

var_dump($categories);

Get the Post Categories From Outside the Loop

$post = get_post();
if ( $post ) {
    $categories = get_the_category( $post->ID );
    var_dump( $categories );
}

Read more on: WordPress

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