php中的不同摘录

Question

Hi how to excerpt this code using php ?

It's the wordpress content . but there is not this way in wordpress

From

<div class='first'>first</div>
<div class='second'>second</div>
<div class='first'>first</div>
<div class='second'>second</div>
<div class='first'>first</div>
<div class='second'>second</div>
.
.
.

To

<div class='first'>first</div>
<div class='second'>second</div>

Answer 1

you can try this using preg_replace_callback:

//if html is retrieved in a variable like $html, then
$html = "<div class='first'>first</div>
<div class='second'>second</div>
<div class='first'>first</div>
<div class='second'>second</div>
<div class='first'>first</div>
<div class='second'>second</div>";


$validate = array('first'=>true,'second'=>true);
$response = trim(preg_replace_callback('/<div\s?.*\/div>/',function($match)use(&$validate){
    reset($validate);$key = key($validate);
    if(strstr($match[0],$key) != false && $validate[$key] == true){
        $validate[$key] = false;
        return $match[0];
    }
    next($validate);$key = key($validate);
    if(strstr($match[0],$key) != false && $validate[$key] == true){
        $validate[$key] = false;
        return $match[0];
    }
},$html));
var_dump($response);