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_wp_preview_terms_filter( array $terms, int $post_id, string $taxonomy )

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Filters terms lookup to set the post format.

Parameters

$terms

(array) (Required)

$post_id

(int) (Required)

$taxonomy

(string) (Required)

Return

(array)

Source

File: wp-includes/revision.php 

function _wp_preview_terms_filter( $terms, $post_id, $taxonomy ) {
	$post = get_post();
	if ( ! $post ) {
		return $terms;
	}

	if ( empty( $_REQUEST['post_format'] ) || $post->ID != $post_id
		|| 'post_format' !== $taxonomy || 'revision' === $post->post_type
	) {
		return $terms;
	}

	if ( 'standard' === $_REQUEST['post_format'] ) {
		$terms = array();
	} else {
		$term = get_term_by( 'slug', 'post-format-' . sanitize_key( $_REQUEST['post_format'] ), 'post_format' );
		if ( $term ) {
			$terms = array( $term ); // Can only have one post format.
		}
	}

	return $terms;
}

Uses

Uses Description
wp-includes/formatting.php: sanitize_key()

Sanitizes a string key.
wp-includes/taxonomy.php: get_term_by()

Get all Term data from database by Term field and data.
wp-includes/post.php: get_post()

Retrieves post data given a post ID or post object.

Changelog

Version Description
3.6.0 Introduced.

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