我想替换帖子内容中的几个字。例如

原件：

Here is my test string. 
Which Need to Replace First Test word in the string.

例外字符串：

Here is my <a href="link"> test </a> string. 
Which Need to Replace First Test word in the string.

我已经试过了，但我很少遇到问题。

当该单词与单词一起具有预定义链接时。喜欢

Here is my <a href="test case link"> test Case </a> string. 
Which Need to Replace First Test word in the string.

所以我的函数把它分解成两个词

Here is my <a href="link"> test </a> <a href="test case link"> Case </a> string.
Which Need to Replace First Test word in the string.

==我的解决方案====

add_filter(\'the_content\' , \'update_content\');

function update_content($content){
        if((is_singular()){
            $termsList = array(
                 \'test\' => \'<a href="test">test</a>\'
            );

            foreach($termsList as $word => $term_link){

                //$content = str_replace($word , $replacement , $content , $count);
                //Convert into Smaller Case
                $str_content = strtolower($content);
                $str_word = strtolower($word);


                //Get the position of the word
                $position = strpos($str_content, $str_word , 0); 
                //Get the Exact word with case sensitive 
                $match_string = substr ($content , $position , strlen($word) );

                //Prepare Replacement
                $replacement = \'<a href="\'.$term_link.\'">\'.$match_string.\'</a>\';


                if(!empty($position)){
                    //Replace The word
                    $content = substr_replace($content, $replacement, $position, strlen($word));
                }

            }
        }

        return $content;
    }