之前设计WordPress主题的时候调用图片一般都是用文章内附件图片,但是有些博主为了节约博客主机空间,大部分采用外联图片,这样就无法同过这种方式调用了,所以只能用下面的这种方式来调用文章的第一张图片,WordPress调用文章第一张图片代码如下:
1 在WordPress主题的功能函数function.php文件内添加以下代码,这些 代码主要是查找文章内有没有图片并调用第一张图片地址,其工作原理是查找文章内有没<img />这个标签,如果有就调出第一张图片,如果没有就用张设计好的图片代替,这个方式用来作为文章缩略图非常有用,具体代码如下,拷贝到 function.php <?php … ?>之间即可.
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function catch_that_image() { global $post, $posts; $first_img = ''; ob_start(); ob_end_clean(); $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches); $first_img = $matches [1] [0]; if(empty($first_img)){ //Defines a default image $first_img = "/images/default.jpg"; } return $first_img; }
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Wordpress 主题模板调用 catch_that_image()函数,方法很简单,在需要的地方插入 <img src="<?php echo catch_that_image() ?>" alt="<?php printf( esc_attr__( 'Permalink to %s', 'catchbox' ), the_title_attribute( 'echo=0' ) ); ?> www.banysky.net 帮你资源网" />即可,例如我是在首页插入,我修改了Content.php
全文如下:
<?php /** * The default template for displaying content * * @package Catch Themes * @subpackage Catch_Box * @since Catch Box 1.0 */ ?> <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>> <header class="entry-header"> <?php if ( is_sticky() ) : ?> <hgroup> <h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'catchbox' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2> <h3 class="entry-format"><?php _e( 'Featured', 'catchbox' ); ?></h3> </hgroup> <?php else : ?> <h1 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'catchbox' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h1> <?php endif; ?> <?php if ( 'post' == get_post_type() ) : ?> <div class="entry-meta"> <?php catchbox_posted_on(); ?> <?php if ( comments_open() && ! post_password_required() ) : ?> <span class="sep"> — </span> <span class="comments-link"> <?php comments_popup_link(__('No Comments ↓', 'catchbox'), __('1 Comment ↓', 'catchbox'), __('% Comments ↓', 'catchbox')); ?> </span> <?php endif; ?> </div><!-- .entry-meta --> <?php endif; ?> </header><!-- .entry-header --> <?php $options = catchbox_get_theme_options(); $current_content_layout = $options['content_layout']; ?> <?php if ( is_search() ) : // Only display Excerpts for Search ?> <div class="entry-summary"> <?php the_excerpt(); ?> </div><!-- .entry-summary --> <?php elseif ($current_content_layout=='excerpt' ) : // Only display Featured Image and Excerpts if checked in Theme Option ?> <div class="entry-summary"> <?php if( has_post_thumbnail() ):?> <a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'catchbox' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"> <?php the_post_thumbnail('featured-slider'); ?> </a> <?php endif; ?> <img src="<?php echo catch_that_image() ?>" alt="<?php printf( esc_attr__( 'Permalink to %s', 'catchbox' ), the_title_attribute( 'echo=0' ) ); ?> www.banysky.net 帮你资源网" /> <?php the_excerpt(); ?> </div><!-- .entry-summary --> <?php else : ?> <div class="entry-content"> <?php the_content( __( 'Continue reading <span class="meta-nav">→</span>', 'catchbox' ) ); ?> <?php wp_link_pages( array( 'before' => '<div class="page-link"><span class="pages">' . __( 'Pages:', 'catchbox' ) . '</span>', 'after' => '</div>', 'link_before' => '<span>', 'link_after' => '</span>', ) ); ?> </div><!-- .entry-content --> <?php endif; ?> <footer class="entry-meta"> <?php $show_sep = false; ?> <?php if ( 'post' == get_post_type() ) : // Hide category and tag text for pages on Search ?> <?php /* translators: used between list items, there is a space after the comma */ $categories_list = get_the_category_list( __( ', ', 'catchbox' ) ); if ( $categories_list ): ?> <span class="cat-links"> <?php printf( __( '<span class="%1$s">Posted in</span> %2$s', 'catchbox' ), 'entry-utility-prep entry-utility-prep-cat-links', $categories_list ); $show_sep = true; ?> </span> <?php endif; // End if categories ?> <?php /* translators: used between list items, there is a space after the comma */ $tags_list = get_the_tag_list( '', __( ', ', 'catchbox' ) ); if ( $tags_list ): if ( $show_sep ) : ?> <span class="sep"> | </span> <?php endif; // End if $show_sep ?> <span class="tag-links"> <?php printf( __( '<span class="%1$s">Tagged</span> %2$s', 'catchbox' ), 'entry-utility-prep entry-utility-prep-tag-links', $tags_list ); $show_sep = true; ?> </span> <?php endif; // End if $tags_list ?> <?php endif; // End if 'post' == get_post_type() ?> <?php if ( comments_open() ) : ?> <?php if ( $show_sep ) : ?> <span class="sep"> | </span> <?php endif; // End if $show_sep ?> <span class="comments-link"><?php comments_popup_link( '<span class="leave-reply">' . __( 'Leave a reply', 'catchbox' ) . '</span>', __( '<b>1</b> Reply', 'catchbox' ), __( '<b>%</b> Replies', 'catchbox' ) ); ?></span> <?php endif; // End if comments_open() ?> <?php edit_post_link( __( 'Edit', 'catchbox' ), '<span class="edit-link">', '</span>' ); ?> </footer><!-- #entry-meta --> </article><!-- #post-<?php the_ID(); ?> -->
想要更好的显示效果就需要修改css样式来美化你的WordPress主题模板了。
声明:调用文章第一张图片如果是外联图片就无法支持timthumb图片剪切功能,如果你是WordPress主题设计高手,建议用phpthumb,phpthumb是可以支持外联图片的,大家不放试试,good luck!