Teste

gistfile1.php

<?php
function get_content_link( $content = false, $echo = false ) {
    if ( $content === false )
        $content = get_the_content(); 

    $content = preg_match_all( '/hrefs*=s*["']([^"']+)/', $content, $links );
    $content = $links[1][0];

    if ( empty($content) ) {
      $content = false;
    }

    return $content;
}

?>