嗨，伙计们，你能告诉我如何在我的代码中获取post\\u内容的摘录长度为15吗：

<?php
$args = array( \'numberposts\' => \'2\', \'tax_query\' => array(
        array(
            \'taxonomy\' => \'post_format\',
            \'field\' => \'slug\',
            \'terms\' => \'post-format-aside\',
            \'operator\' => \'NOT IN\'
        ), 
        array(
            \'taxonomy\' => \'post_format\',
            \'field\' => \'slug\',
            \'terms\' => \'post-format-image\',
            \'operator\' => \'NOT IN\'
        )
) );


$recent_posts = wp_get_recent_posts( $args );
foreach( $recent_posts as $recent ){
    echo 
    \'<div class="news_home">
  <div class="content_left"><img src="\'.get_permalink($recent[\'ID\'])."\'>".get_the_post_thumbnail($recent[\'ID\']).\'</div>
  <div class="content_right">
    <h4> \'.   ( __($recent["post_title"])).\'</h4>
    <span>\'. mysql2date(\'j.m.Y\', $recent["post_date"]) .\'</span>
    <div class="HR_ornament">
      <hr class="news_hr"/>
      <div class="ornament_news"></div>
    </div>
    <p class="news_text">\'.( __($recent["post_content"])).\'
            <a href="\' . get_permalink($recent["ID"]) . \'">[...]</a> 
    </p></div>
</div> 
\';