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the_category_ID( bool $echo = true )

This function has been deprecated. Use get_the_category() instead.

Returns or prints a category ID.

Description

See also

Parameters

$echo

(bool) (Optional) Whether to echo the output.

Default value: true

Return

(int) Category ID.

Source

File: wp-includes/deprecated.php 

function the_category_ID($echo = true) {
	_deprecated_function( __FUNCTION__, '0.71', 'get_the_category()' );

	// Grab the first cat in the list.
	$categories = get_the_category();
	$cat = $categories[0]->term_id;

	if ( $echo )
		echo $cat;

	return $cat;
}

Uses

Uses Description
wp-includes/category-template.php: get_the_category()

Retrieves post categories.
wp-includes/functions.php: _deprecated_function()

Mark a function as deprecated and inform when it has been used.

Changelog

Version Description
0.71 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/the_category_id