WordPress纯代码判断当前文章是否被百度收录

WordPress纯代码判断当前文章是否被百度收录方法：

把以下代码添加至当前主题的 functions.php 中

//判断文章是否被百度收录
function baidu_check($url){
    global $wpdb;
    $post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
    $baidu_record  = get_post_meta($post_id,'baidu_record',true);
    if( $baidu_record != 1){
        $url='http://www.baidu.com/s?wd='.$url;
        $curl=curl_init();
        curl_setopt($curl,CURLOPT_URL,$url);
        curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
        $rs=curl_exec($curl);
        curl_close($curl);
        if(!strpos($rs,'没有找到')){
            if( $baidu_record == 0){
                update_post_meta($post_id, 'baidu_record', 1);
            } else {
                add_post_meta($post_id, 'baidu_record', 1, true);
            }
                return 1;
        } else {
            if( $baidu_record == false){
                add_post_meta($post_id, 'baidu_record', 0, true);
            }
            return 0;
        }
    } else {
       return 1;
    }
}
function baidu_record() {
    if(baidu_check(get_permalink()) == 1) {
        echo '<a target="_blank" title="点击查看" rel="external nofollow" href="http://www.baidu.com/s?wd='.get_the_title().'">百度已收录</a>';
   } else {
        echo '<a style="color:#c40000;font-size:15px" rel="external nofollow"  title="提交链接" target="_blank" href="http://zhanzhang.baidu.com/sitesubmit/index?sitename='.get_permalink().'">百度未收录</a>';
   }
}
//END

在当前主题的 single.php 文件适当的位置添加下面的代码调用：

<?php baidu_record(); ?>