is_sticky() WP 1.0

Check if post is sticky.

Sticky posts should remain at the top of The Loop. If the post ID is not given, then The Loop ID for the current post will be used.

For more information on this and similar theme functions, check out the Conditional Tags article in the Theme Developer Handbook.

No Hooks.

Return

true/false. Whether post is sticky.

Usage

is_sticky( $post_id );

$post_id(int)

Post ID.
Default: ID of the global $post

Code of is sticky: wp-includes/post.php ^{WP 5.2.1}

<?php
function is_sticky( $post_id = 0 ) {
	$post_id = absint( $post_id );

	if ( ! $post_id ) {
		$post_id = get_the_ID();
	}

	$stickies = get_option( 'sticky_posts' );

	if ( ! is_array( $stickies ) ) {
		return false;
	}

	if ( in_array( $post_id, $stickies ) ) {
		return true;
	}

	return false;
}

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