WordPress发布文章自动同步到新浪微博（带特色图片）

/**
* WordPress发布文章同步到新浪微博（带图片&自定义栏目版）
* 文章地址：http://zhangge.net/4947.html
*/
function post_to_sina_weibo($post_ID) {
   /* 鉴于很多朋友反馈发布文章空白，临时加上调试代码，若无问题可删除此行，若有问题请将错误信息在本文留言即可 */
   ini_set('display_errors', true);

   /* 此处修改为通过文章自定义栏目来判断是否同步 */
   if(get_post_meta($post_ID,'weibo_sync',true) == 1) return;

   $get_post_info = get_post($post_ID);
   $get_post_centent = get_post($post_ID)->post_content;
   $get_post_title = get_post($post_ID)->post_title;
   if ($get_post_info->post_status == 'publish' && $_POST['original_post_status'] != 'publish') {
       $appkey='1034947262'; /* 此处是你的新浪微博appkey，不修改的话就会显示来自张戈博客哦！ */
       $username='微博用户名';
       $userpassword='微博密码';
       $request = new WP_Http;
       $keywords = "";

       /* 获取文章标签关键词 */
       $tags = wp_get_post_tags($post_ID);
       foreach ($tags as $tag ) {
          $keywords = $keywords.'#'.$tag->name."#";
       }

      /* 修改了下风格，并添加文章关键词作为微博话题，提高与其他相关微博的关联率 */
     $get_post_category_weiboname =get_the_category($post_ID)[0]->cat_name;
     $string1 = '【'.$get_post_category_weiboname.'】' . strip_tags( $get_post_title ).'：';
     $string2 = $keywords.' 查看全文：'.get_permalink($post_ID);

     /* 微博字数控制，避免超标同步失败 */
      $wb_num = (138 - WeiboLength($string1.$string2))*2;
      $status = $string1.mb_strimwidth(strip_tags( apply_filters('the_content', $get_post_centent)),0, $wb_num,'...').$string2;

       /* 获取特色图片，如果没设置就抓取文章第一张图片 */
       

$url = get_mypost_thumbnail($post_ID);

       /* 判断是否存在图片，定义不同的接口 */
       if(!empty($url)){
           $api_url = 'https://api.weibo.com/2/statuses/upload_url_text.json'; /* 新的API接口地址 */
           $body = array('status' => $status,'source' => $appkey,'url' => $url);
       } else {
           $api_url = 'https://api.weibo.com/2/statuses/update.json';
           $body = array('status' => $status,'source' => $appkey);
       }
       $headers = array('Authorization' => 'Basic ' . base64_encode("$username:$userpassword"));
       $result = $request->post($api_url, array('body' => $body,'headers' => $headers));

       /* 若同步成功，则给新增自定义栏目weibo_sync，避免以后更新文章重复同步 */
       add_post_meta($post_ID, 'weibo_sync', 1, true);
    }
}
add_action('publish_post', 'post_to_sina_weibo', 0);

/*
//获取微博字符长度函数
*/
function WeiboLength($str)
{
    $arr = arr_split_zh($str);   //先将字符串分割到数组中
    foreach ($arr as $v){
        $temp = ord($v);        //转换为ASCII码
        if ($temp > 0 && $temp < 127) {
            $len = $len+0.5;
        }else{
            $len ++;
        }
    }
    return ceil($len);        //加一取整
}
/*
//拆分字符串函数,只支持 gb2312编码
//参考：http://u-czh.iteye.com/blog/1565858
*/
function arr_split_zh($tempaddtext){
    $tempaddtext = iconv("UTF-8", "GBK//IGNORE", $tempaddtext);
    $cind = 0;
    $arr_cont=array();
    for($i=0;$i<strlen($tempaddtext);$i++)
    {
        if(strlen(substr($tempaddtext,$cind,1)) > 0){
            if(ord(substr($tempaddtext,$cind,1)) < 0xA1 ){ //如果为英文则取1个字节
                array_push($arr_cont,substr($tempaddtext,$cind,1));
                $cind++;
            }else{
                array_push($arr_cont,substr($tempaddtext,$cind,2));
                $cind+=2;
            }
        }
    }
    foreach ($arr_cont as &$row)
    {
        $row=iconv("gb2312","UTF-8",$row);
    }
    return $arr_cont;
}

/**
* WordPress 获取文章图片加强版 By 张戈博客
*/
if(!function_exists('get_mypost_thumbnail')){
  function get_mypost_thumbnail($post_ID){
     if (has_post_thumbnail()) {
            $timthumb_src = wp_get_attachment_image_src( get_post_thumbnail_id($post_ID), 'full' );
            $url = $timthumb_src[0];
    } else {
        if(!$post_content){
            $post = get_post($post_ID);
            $post_content = $post->post_content;
        }
        preg_match_all('|<img.*?src=[\'"](.*?)[\'"].*?>|i', do_shortcode($post_content), $matches);
        if( $matches && isset($matches[1]) && isset($matches[1][0]) ){
            $url =  $matches[1][0];
        }else{
            $url =  '';
        }
    }
    return $url;
  }
}

<?php get_the_category( $id ) ?>

<?php

  $category = get_the_category();

  echo $category[0]->cat_name;

?>

<?php
$cat = get_the_category();

foreach($cat as $key=>$category)
{
    echo $category->cat_name.'<br/>';
}

?>

<?php
	 $categories = get_the_category();
	  
	 var_dump($categories);
	?>
	//显示的内容就是上面提到的返回值

$url = preg_replace('/https:\/\//i','http://',$url);