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<?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;
}
?>

• Function Reference/is sticky « WordPress Codex
  Description. This Conditional Tag checks if "Stick this post to the front page" check box has been checked for the current post. This is a boolean function, ...
  codex.wordpress.org
• Conditional Tags « WordPress Codex
  is_sticky(): Returns true if "Stick this post to the front page" check box has been checked for the current post. In this example, no post ID argument is given, so the ...
  codex.wordpress.org
• Fatal error: Call to undefined function is_sticky() « Antisocial Media ...
  Apr 9, 2012 ... If you are using one of our themes and getting a fatal error message: Call to undefined function is_sticky(): Cause: You are using a version of ...
  www.antisocialmediallc.com
• Wordpress 2.7 error: Cannot redeclare is_sticky() - Knowledgebase ...
  Symptom: After upgrading to Wordpress 2.7, users who have the wp-sticky plugin active may see the following error: Fatal error: Cannot redeclare is_sticky() ...
  secure.hostmatters.com

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