<?php single_cat_title($prefix,$display); ?>

 <?php
printf( __( 'Category Archives: %s', 'twentyeleven' ), '<span>' . single_cat_title( '', false ) . '</span>' );
?>

<?php the_title( $before, $after, $echo ); ?>

<?php the_title( ‘=>', ‘<=' ); ?>

‘=>get_the_title 和 the_title<='

<?php $myTitle = get_the_title($ID); ?>

<?php
 $myTitle = get_the_title($ID); 
 echo $mytitle.'【标题演示】';
?>

<?php
/**
 * Display or retrieve the current post title with optional content.
 *
 * @since 0.71
 *
 * @param string $before Optional. Content to prepend to the title.
 * @param string $after Optional. Content to append to the title.
 * @param bool $echo Optional, default to true.Whether to display or return.
 * @return null|string Null on no title. String if $echo parameter is false.
 */
function the_title($before = '', $after = '', $echo = true) {
 $title = get_the_title();
 
 if ( strlen($title) == 0 )
 return;
 
 $title = $before . $title . $after;
 
 if ( $echo )
 echo $title;
 else
 return $title;
}
?>

<?php
/**
 * Retrieve post title.
 *
 * If the post is protected and the visitor is not an admin, then "Protected"
 * will be displayed before the post title. If the post is private, then
 * "Private" will be located before the post title.
 *
 * @since 0.71
 *
 * @param int $id Optional. Post ID.
 * @return string
 */
function get_the_title( $id = 0 ) {
 $post = &get_post($id);
 
 $title = isset($post->post_title) ? $post->post_title : '';
 $id = isset($post->ID) ? $post->ID : (int) $id;
 
 if ( !is_admin() ) {
 if ( !empty($post->post_password) ) {
  $protected_title_format = apply_filters('protected_title_format', __('Protected: %s'));
  $title = sprintf($protected_title_format, $title);
 } else if ( isset($post->post_status) && 'private' == $post->post_status ) {
  $private_title_format = apply_filters('private_title_format', __('Private: %s'));
  $title = sprintf($private_title_format, $title);
 }
 }
 return apply_filters( 'the_title', $title, $id );
}
?>