利用pullword分词API实现自动添加wordpress文章关键词keyword

如果有其他中文分词API，也可以将以下代码修改后使用
/*
* keywords自动关键词 2021.6.22修正
* ====================================================
*/
//去重
function mbstringtoarray($str,$charset) {
$strlen=mb_strlen($str);
while($strlen){
$array[]=mb_substr($str,0,1,$charset);
$str=mb_substr($str,1,$strlen,$charset);
$strlen=mb_strlen($str);
}
return $array;
}
//利用pullword分词API实现提取文章标题中的关键词作为keyword
function auto_add_pullword_Keywords() {
global $post;
// 文章标题
$pullwordtitle = get_the_title( $post->ID );
// 中文标题中包含的英文一般都是完整的关键词.
// 而pullword这个分词工具对英文的效果不太好, 这里先将英文关键词提取出来
preg_match_all('/[a-zA-Z]+[0-9a-zA-Z]+/', $pullwordtitle, $pullwordmatches);
$engKeywords = join(",", $pullwordmatches[0]);
// 调用pullword api, param1为最低概率阈值, param2为debug模式开关(0=关闭)
$pullwordurl='http://api.pullword.com/get.php?source='. urlencode($pullwordtitle) .'¶m1=0¶m2=0';
$pullwordhtml = trim(file_get_contents($pullwordurl));
if ($pullwordhtml == "error"){
return $engKeywords;
}
// 将分词得到的关键词拼接
$pullwordkeywords = str_replace("\n",",",$pullwordhtml);
if ($pullwordkeywords != ""){
if ($engKeywords != ""){
$pullwordkeywords = $pullwordkeywords ;//. "," . $engKeywords;
}
}
return $pullwordkeywords;
}
function _keywords()
{
global $s, $post;
$keywords = '';
$pullword = auto_add_pullword_Keywords(); //引入pullword分词结果
if ( is_singular() ) {
if ( get_the_tags( $post->ID ) ) {
foreach ( get_the_tags( $post->ID ) as $tag ) $keywords .= $tag->name . ',';
}
foreach ( get_the_category( $post->ID ) as $category ) $keywords .= $category->cat_name . ',';
if( _hui('post_keywords_description_s') ) {
$the = trim(get_post_meta($post->ID, 'keywords', true));
if( $the ) $keywords = $the;
}else{
$keywords = substr_replace( $keywords , '' , -1).','.$pullword; //合并pullword分词结果
}

} elseif ( is_search() ) { $keywords = esc_html( $s, 1 );
} else { $keywords = trim( wp_title('', false) );
}
if ( $keywords ) {
echo "\n";
}
}