Wordpress调用文章第一张图片

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"> &mdash; </span> 

                        <span class="comments-link"> 

                             <?php comments_popup_link(__('No Comments &darr;', 'catchbox'), __('1 Comment &darr;', 'catchbox'), __('% Comments &darr;', '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">&rarr;</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!

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