Preg_Replace和Capture Value？ PHP

问题描述：

I'm building a filter plugin in Wordpress and I'm replacing some plugin specific tags with bits of html.

Example: [VIDEO ID=12] will be replaced via preg_replaced in this function

function display_video($text){

   $pattern = '/\[VIDEO ID\=\d+\]/';

   $text=preg_replace($pattern,get_video_block($id),$text);

   return $text;
}

I'm not exactly sure how to make sure I supply the correct ($id) param to my get_video_block function for each replacement occurrence.

There's no real loop going on other than inside the preg_replace function so, how would I supply that value?

Thoughts?

EDIT (get_video_block) function:

function get_video_block($id){
    global $wpdb;
    $wpdb->show_errors();
    $table_name = $wpdb->prefix . "video_manager";
    $query = "SELECT * FROM " . $table_name . " WHERE `index` = '$id'"; 
    $results = $wpdb->get_results($query, ARRAY_A);

    $results = $results[0];

    $returnString = '<div class="vidBlock">';
        $returnString .= $results['embed_code'];

        $returnString .= '<div class="voteBar">';
            $returnString .= $results['vote_text'];
            $returnString .= '<input type="button" value="YES" class="voteButton">';
            $returnString .= '<input type="button" value="NO" class="voteButton">';
        $returnString .= '</div>';

        $returnString .= $results['title'] . '<br>';
        $returnString .= $results['description'] . '<br>';

    $returnString .= '</div>';

    return $returnString;

}

我正在Wordpress中构建一个过滤器插件，我正在用一些html替换一些插件特定的标签。 / p>

示例：[VIDEO ID = 12]将通过此函数中的preg_replaced替换 p>

  function display_video（$ text）{
 \  n $ pattern ='/ \ [VIDEO ID \ = \ d + \] /'; 
 
 $ text = preg_replace（$ pattern，get_video_block（$ id），$ text）; 
 
返回$ text; \  n} 
  code>  pre> 
 
 我不确定如何确保为每次替换事件向get_video_block函数提供正确的（$ id）参数。 p  > 
 
 
除了在preg_replace函数内部之外没有真正的循环，所以，我将如何提供该值？ p> 
 
 
思考？ p> 
 
  
 EDIT（get_video_block）函数： p> 
 
 
  function get_video_block（$ id）{
 global $ wpdb; 
 $ wpdb-＆gt; show_errors（）; 
 $  table_name = $ wpdb-＆gt;前缀。  “video_manager”; 
 $ query =“SELECT * FROM”。  $ table_name。  “WHERE`index` ='$ id'”;  
 $ results = $ wpdb-＆gt; get_results（$ query，ARRAY_A）; 
 
 $ results = $ results [0]; 
 
 $ returnString ='＆lt; div class =“vidBlock”＆gt;'  ; 
 $ returnString。= $ results ['embed_code']; 
 
 $ returnString。='＆lt; div class =“voteBar”＆gt;'; 
 $ returnString。= $ results ['vote_text'];  
 $ returnString。='＆lt; input type =“button”value =“YES”class =“voteButton”＆gt;'; 
 $ returnString。='＆lt; input type =“button”value =“NO”class  =“voteButton”＆gt;'; 
 $ returnString。='＆lt; / div＆gt;'; 
 
 $ returnString。= $ results ['title']。  '＆lt; br＆gt;'; 
 $ returnString。= $ results ['description']。  '＆lt; br＆gt;'; 
 
 $ returnString。='＆lt; / div＆gt;'; 
 
返回$ returnString; 
 
} 
  code>  pre> 
   DIV>

答

You can use preg_replace_callback() for that purpose. You'll also need to wrap \d+ in ( parentheses ) so it can be captured and used in the callback function.

function display_video($text) {
    $callback = create_function('$matches', 'return get_video_block($matches[1])');
    return preg_replace_callback('/\[VIDEO ID\=(\d+)\]/', $callback, $text);
}

Note that $matches[1] is used because $matches[0] contains the entire string matched by the regular expression.

Erwin's comment may be of use to you — WordPress has a shortcode API that manages parsing of shortcodes for you, so you can concentrate on dealing with what you want to do with the shortcode attributes.

Preg_Replace和Capture Value？ PHP

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