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<?php
function has_excerpt( $id = 0 ) {
    $post = &get_post( $id );
    return ( !empty( $post->post_excerpt ) );
}
?>

• Function Reference/has excerpt « WordPress Codex
  Description. Whether the current post has an excerpt. Usage. <?php has_excerpt ( $id ); ?> Parameters. $id: (integer) (optional) Post ID. Default: Current post ID ...
  codex.wordpress.org
• Conditional Tags « WordPress Codex
  <?php // Get $post if you're inside a function global $post; if ( empty( $post-> post_excerpt ) ) { // This post has no excerpt } else { // This post has excerpt } ?> ...
  codex.wordpress.org
• has_excerpt (WordPress Function) - WPSeek.com
  WordPress lookup for has_excerpt, a WordPress Function. wpseek.com is a WordPress-centric search tool for developers and theme authors.
  wpseek.com
• Make Your WordPress Blog Show Manual Excerpts | Welcome To ...
  Jan 12, 2010 ... if (function_exists('has_excerpt') && has_excerpt()) the_content();. The only difference is that it ends in the_content() , rather than the_excerpt() .
  welcometowp.com

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