描述：

获取当前文章的摘要

用法：

 <?php $excerpt = get_the_excerpt( $deprecated ) ?>

示例：

<?php
$my_excerpt = get_the_excerpt();
if ( '' != $my_excerpt ) {
	// Some string manipulation performed
}
echo $my_excerpt; // Outputs the processed value to the page
?>

源文件：

/**
 * Retrieve the post excerpt.
 *
 * @since 0.71
 *
 * @param mixed $deprecated Not used.
 * @return string
 */
function get_the_excerpt( $deprecated = '' ) {
	if ( !empty( $deprecated ) )
		_deprecated_argument( __FUNCTION__, '2.3' );

	$post = get_post();
	if ( empty( $post ) ) {
		return '';
	}

	if ( post_password_required() ) {
		return __( 'There is no excerpt because this is a protected post.' );
	}

	/**
	 * Filter the retrieved post excerpt.
	 *
	 * @since 1.2.0
	 *
	 * @param string $post_excerpt The post excerpt.
	 */
	return apply_filters( 'get_the_excerpt', $post->post_excerpt );
}