我在你的主题函数中使用这个。php

// function (image toolbox) for all images
 function attachment_toolbox($size = thumbnail) { 

if($images = get_children(array(
    \'post_parent\'    => get_the_ID(),
    \'post_type\'      => \'attachment\',
    \'numberposts\'    => 1, // show all images is -1
    \'post_status\'    => null,
    \'post_mime_type\' => \'image\',
))) {
    foreach($images as $image) {
        $attimg   = wp_get_attachment_image($image->ID,$size);

        $postlink = get_permalink($image->post_parent);


        echo \'<a href="\'.$postlink.\'">\'.$attimg.\'</a>\';

    }
}

}

在你的循环中调用

<div class="around_image"> 
  <?php attachment_toolbox(\'medium\'); ?>
</div><!-- / around_image -->

这是直接从我的网站我现在正在工作，改变“中”的图片大小，你想要的，“缩略图”，“中”，“大”或“全尺寸”

有关详细信息go here

/**
 * @author: wpreceipes
 * @link: [1]: http://www.wprecipes.com/how-to-get-the-first-image-from-the-post-and-display-it
 */
function wpse18215_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];

    //Defines a default image
    if( empty( $first_img ) )
    { 
        $first_img = \'/images/default.jpg\';
    }
    return $first_img;
}

示例：

echo catch_that_image();

或：

/**
 * @author: Marcelo Mesquita
 * @link: http://marcelomesquita.com/
 * @param (string) $size - valid: \'thumbnail\', \'medium\', \'large\' or \'full_size\'
 * @param (string) $add - any additional attributes for the html-img tag
 */
function wpse18215_the_thumb( $size = \'medium\', $add = \'\' )
{
    global $wpdb, $post;

    $thumb = $wpdb->get_row( 
        "SELECT ID, 
         post_title 
         FROM {$wpdb->posts} 
         WHERE post_parent = {$post->ID} 
         AND post_mime_type 
         LIKE \'image%\' 
         ORDER BY menu_order"
    );

    if( ! empty( $thumb ) )
    {
        $image = image_downsize( $thumb->ID, $size );
        return "<img src=\'{$image[0]}\' alt=\'{$thumb->post_title}\' {$add} />";
    }
}

示例：

echo wpse18215_the_thumb( \'medium\', \'class="alignleft" width="200" height="175"\' );

<人力资源>Note: 无论如何，您都需要将模板中的调用包装到条件语句中：

if ( is_home() || is_front_page() ) { /* place the function call here */ }