Registering taxonomies with wordpress

webservices.php

public function register_taxonomies()
{
	$tags = [

		'performer' => [
			'name'              => _x( 'Performers', 'taxonomy general name' ),
			'singular_name'     => _x( 'Performer', 'taxonomy singular name' ),
			'search_items'      => __( 'Search Performers' ),
			'all_items'         => __( 'All Performers' ),
			'parent_item'       => null,
			'parent_item_colon' => null
		],

		'city' => [
			'name'              => _x( 'Cities', 'taxonomy general name' ),
			'singular_name'     => _x( 'City', 'taxonomy singular name' ),
			'search_items'      => __( 'Search Cities' ),
			'all_items'         => __( 'All Cities' ),
			'parent_item'       => null,
			'parent_item_colon' => null
		],

		'event-type' => [

			'args' => [
				'hierarchical'      => false,
				'show_ui'           => true,
				'show_admin_column' => true
			],

			'name'              => _x( 'Event Types', 'taxonomy general name' ),
			'singular_name'     => _x( 'Event Type', 'taxonomy singular name' ),
			'search_items'      => __( 'Search Event Types' ),
			'all_items'         => __( 'All Event Types' ),
			'parent_item'       => null,
			'parent_item_colon' => null
		],

		'venue' => [
			'name'              => _x( 'Venues', 'taxonomy general name' ),
			'singular_name'     => _x( 'Venue', 'taxonomy singular name' ),
			'search_items'      => __( 'Search Venues' ),
			'all_items'         => __( 'All Venues' ),
			'parent_item'       => null,
			'parent_item_colon' => null,

		]
	];

	$categories = [
	
		'parent' => [
			'name'              => _x( 'Parent Categories', 'taxonomy general name' ),
			'singular_name'     => _x( 'Parent Category', 'taxonomy singular name' ),
			'search_items'      => __( 'Search Parent Category' ),
			'all_items'         => __( 'All Parent Categories' ),
			'parent_item'       => null,
			'parent_item_colon' => null
		],

		'child' => [
			'name'              => _x( 'Child Categories', 'taxonomy general name' ),
			'singular_name'     => _x( 'Child Category', 'taxonomy singular name' ),
			'search_items'      => __( 'Search Child Category' ),
			'all_items'         => __( 'All Child Categories' ),
			'parent_item'       => __( 'Parent Categories' ),
			'parent_item_colon' => __( 'Parent Categories:' )
		],

		'grandChild' => [
			'name'              => _x( 'Grandchild Categories', 'taxonomy general name' ),
			'singular_name'     => _x( 'Grandchild Category', 'taxonomy singular name' ),
			'search_items'      => __( 'Search Grandchild Category' ),
			'all_items'         => __( 'All Grandchild Categories' ),
			'parent_item'       => __( 'Parent Categories' ),
			'parent_item_colon' => __( 'Parent Categories:' )
		]
	];

	foreach ($tags as $tag) {
	
		if (array_key_exists('args', $tag)) {
		
			$args = $tag['args'];
			
			unset($tag['args']);
			
			$args['labels'] = $tag;
			
		} else {
		
			$args = [
			
				'hierarchical'      => false,
				
				'labels'            => $tag,
				
				'show_ui'           => true
			];
		}

		$name = $tag['singular_name'];
		
		$name = str_replace(' ', '_', strtolower($name));
		
		register_taxonomy($name, 'event_post', $args);
	}

	foreach ($categories as $category) {
	
		$args = [
		
			'hierarchical'      => true,
			
			'labels'            => $category,
			
			'show_ui'           => true
		];
		
		$name = $category['singular_name'];
		
		$name = str_replace(' ', '_', strtolower($name));
		
		register_taxonomy($name, 'event_post', $args);
	}
}