WordPress 教程：the_title() 与 the_title_attribute() 的正确用法

<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>">继续阅读 <?php the_title(); ?></a>

/**
 * 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;
}

/**
 * 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 mixed $post Optional. Post ID or object.
 * @return string
 */
function get_the_title( $post = 0 ) {
        $post = get_post( $post );
        $title = isset( $post->post_title ) ? $post->post_title : '';
        $id = isset( $post->ID ) ? $post->ID : 0;
        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 );
}

/**
 * Sanitize the current title when retrieving or displaying.
 *
 * Works like {@link the_title()}, except the parameters can be in a string or
 * an array. See the function for what can be override in the $args parameter.
 *
 * The title before it is displayed will have the tags stripped and {@link
 * esc_attr()} before it is passed to the user or displayed. The default
 * as with {@link the_title()}, is to display the title.
 *
 * @since 2.3.0
 *
 * @param string|array $args Optional. Override the defaults.
 * @return string|null Null on failure or display. String when echo is false.
 */
function the_title_attribute( $args = '' ) {
        $title = get_the_title();
        if ( strlen($title) == 0 )
                return;
        $defaults = array('before' => '', 'after' =>  '', 'echo' => true);
        $r = wp_parse_args($args, $defaults);
        extract( $r, EXTR_SKIP );
        $title = $before . $title . $after;
        $title = esc_attr(strip_tags($title));
        if ( $echo )
                echo $title;
        else
                return $title;
}

<span class="title">这是有span标签的标题</span>

<span class="title">这是有span标签的标题</span>

这是有span标签的标题

这是一个带 "双引号" 的标题

这是一个带 "双引号" 的标题

这是一个带 \"双引号\" 的标题

<span title="<?php the_title(); ?>"><?php the_title(); ?></span>

<span title="这是一个带 "双引号" 的标题">这是一个带”双引号”的标题</span>

<a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>">继续阅读 <?php the_title(); ?></a>